Virtualization uses software to create an abstraction layer over computer hardware that allows the hardware elements of a single computer-processors, memory, storage and more-to be divided into multiple virtual computers, commonly called virtual machines (VMs).
We aims to provide a complete knowledgeable report so that the readers will benefit from it. The report is properly examined and compiled by industry experts and will shed light on the key information that requires from the clients.
Case numbers are resurging in parts of the world where the COVID-19 pandemic was waning, falling in places that saw huge surges recently, and just beginning to rise in previously little-impacted parts of the globe.
Studying and analyzing the impact of Coronavirus COVID-19 on the User Virtualization Software industry, the report provide in-depth analysis and professtional advices on how to face the post COIVD-19 period.
Market Segment by Product Type
Non-persistent VDI
Persistent VDI
Market Segment by Product Application
SME (Small and Medium Enterprises)
Large Enterprise
Finally, the report provides detailed profile and data information analysis of leading company.
Ivanti
Citrix
AppSense
Microsoft
Vmware
ProfileUnity
Tricerat
Insights and Tools:
Projected and forecast revenue values are in constant U.S. dollars, unadjusted for inflation.
Product values and regional markets are estimated by market analyst, data analyst and people from related industry, based on companys' revenue and applications market respectively.
The data sources include but not limited to reports of companys,international organizations and governments, MMI market surveys,and related industry news.
Analyses of global market trends, with historical data, estimates for 2022 and projections of compound annual growth rates (CAGRs) through 2027
The market research includes historical and forecast data from like demand, application details, price trends, and company shares by geography, especially focuses on the key regions like United States, European Union, China, and other regions.
In addition, the report provides insight into main drivers,challenges,opportunities and risk of the market and strategies of suppliers. Key players are profiled as well with their market shares in the global market discussed.
Research Objectives
1.To study and analyze the global User Virtualization Software consumption (value) by key regions/countries, product type and application, history data from 2017 to 2021, and forecast to 2027.
2.To understand the structure of User Virtualization Software market by identifying its various subsegments.
3.Focuses on the key global User Virtualization Software manufacturers, to define, describe and analyze the value, market share, market competition landscape, Porter's five forces analysis, SWOT analysis and development plans in next few years.
4.To analyze the User Virtualization Software with respect to individual growth trends, future prospects, and their contribution to the total market.
5.To share detailed information about the key factors influencing the growth of the market (growth potential, opportunities, drivers, industry-specific challenges and risks).
6.To project the consumption of User Virtualization Software submarkets, with respect to key regions (along with their respective key countries).
7.To analyze competitive developments such as expansions, agreements, new product launches, and acquisitions in the market.
8.To strategically profile the key players and comprehensively analyze their growth strategies.
Table of Contents
Global User Virtualization Software Market Status and Outlook 2022-2027
Market Study Overview
1.1 Study Objectives
1.2 User Virtualization Software Introduce
1.3 Combined with the Analysis of Macroeconomic Indicators
1.4 Brief Description of Research methods
1.5 Market Breakdown and Data Triangulation
2 Global Trend Summary
2.1 User Virtualization Software Segment by Type
2.1.1 Non-persistent VDI
2.1.2 Persistent VDI
2.2 Market Analysis by Application
2.2.1 SME (Small and Medium Enterprises)
2.2.2 Large Enterprise
2.3 Global User Virtualization Software Market Comparison by Regions (2017-2027)
2.3.1 Global User Virtualization Software Market Size (2017-2027)
2.3.2 North America User Virtualization Software Status and Prospect (2017-2027)
2.3.3 Europe User Virtualization Software Status and Prospect (2017-2027)
2.3.4 Asia-pacific User Virtualization Software Status and Prospect (2017-2027)
2.3.5 South America User Virtualization Software Status and Prospect (2017-2027)
2.3.6 Middle East & Africa User Virtualization Software Status and Prospect (2017-2027)
2.5 Coronavirus Disease 2019 (Covid-19): User Virtualization Software Industry Impact
2.5.1 User Virtualization Software Business Impact Assessment - Covid-19
2.5.2 Market Trends and User Virtualization Software Potential Opportunities in the COVID-19 Landscape
2.5.3 Measures / Proposal against Covid-19
3 Competition by Vendors
3.1 Global User Virtualization Software Revenue and Market Share by Vendors (2017-2022)
3.2 Global User Virtualization Software Industry Concentration Ratio (CR5 and HHI)
3.3 Top 5 User Virtualization Software Vendors Market Share
3.4 Top 10 User Virtualization Software Vendors Market Share
3.5 Date of Key Vendors Enter into User Virtualization Software Market
3.6 Key Vendors User Virtualization Software Product Offered
3.7 Mergers & Acquisitions Planning
4 Analysis of User Virtualization Software Industry Key Vendors
4.1 Ivanti
4.1.1 Company Details
4.1.2 Product Introduction, Application and Specification
4.1.3 Ivanti User Virtualization Software Gross Margin, and Revenue (2017-2022)
4.1.4 Main Business Overview
4.1.5 Ivanti News
4.2 Citrix
4.2.1 Company Details
4.2.2 Product Introduction, Application and Specification
4.2.3 Citrix User Virtualization Software Gross Margin, and Revenue (2017-2022)
4.2.4 Main Business Overview
4.2.5 Citrix News
4.3 AppSense
4.3.1 Company Details
4.3.2 Product Introduction, Application and Specification
4.3.3 AppSense User Virtualization Software Gross Margin, and Revenue (2017-2022)
4.3.4 Main Business Overview
4.3.5 AppSense News
4.4 Microsoft
4.4.1 Company Details
4.4.2 Product Introduction, Application and Specification
4.4.3 Microsoft User Virtualization Software Gross Margin, and Revenue (2017-2022)
4.4.4 Main Business Overview
4.4.5 Microsoft News
4.5 Vmware
4.5.1 Company Details
4.5.2 Product Introduction, Application and Specification
4.5.3 Vmware User Virtualization Software Gross Margin, and Revenue (2017-2022)
4.5.4 Main Business Overview
4.5.5 Vmware News
4.6 ProfileUnity
4.6.1 Company Details
4.6.2 Product Introduction, Application and Specification
4.6.3 ProfileUnity User Virtualization Software Gross Margin, and Revenue (2017-2022)
4.6.4 Main Business Overview
4.6.5 ProfileUnity News
4.7 Tricerat
4.7.1 Company Details
4.7.2 Product Introduction, Application and Specification
4.7.3 Tricerat User Virtualization Software Gross Margin, and Revenue (2017-2022)
4.7.4 Main Business Overview
4.7.5 Tricerat News
5 Global User Virtualization Software Market Size Categorized by Regions
5.1 Global User Virtualization Software Revenue and Market Share by Regions
5.2 North America User Virtualization Software Revenue and Growth Rate (2017-2022)
5.3 Europe User Virtualization Software Revenue and Growth Rate (2017-2022)
5.4 Asia-pacific User Virtualization Software Revenue and Growth Rate (2017-2022)
5.5 South America User Virtualization Software Revenue and Growth Rate (2017-2022)
5.6 Middle East & Africa User Virtualization Software Revenue and Growth Rate (2017-2022)
6 North America User Virtualization Software Market Size Categorized by Countries
6.1 North America User Virtualization Software Revenue and Market Share by Countries
6.1.1 North America User Virtualization Software Market Size by Countries (2017-2022)
6.1.2 United States User Virtualization Software Revenue and Growth Rate (2017-2022)
6.1.3 Canada User Virtualization Software Revenue and Growth Rate (2017-2022)
6.1.4 Mexico User Virtualization Software Revenue and Growth Rate (2017-2022)
6.2 North America User Virtualization Software Revenue (Value) by Vendors
6.3 North America User Virtualization Software Revenue and Market Share by Type (2017-2022)
6.4 North America User Virtualization Software Revenue and Market Share by Application (2017-2022)
7 Europe User Virtualization Software Market Size Categorized by Countries
7.1 Europe User Virtualization Software Revenue and Market Share by Countries
7.1.1 Europe User Virtualization Software Market Size by Countries (2017-2022)
7.1.2 Germany User Virtualization Software Revenue and Growth Rate (2017-2022)
7.1.3 UK User Virtualization Software Revenue and Growth Rate (2017-2022)
7.1.4 France User Virtualization Software Revenue and Growth Rate (2017-2022)
7.1.5 Russia User Virtualization Software Revenue and Growth Rate (2017-2022)
7.1.6 Italy User Virtualization Software Revenue and Growth Rate (2017-2022)
7.1.7 Spain User Virtualization Software Revenue and Growth Rate (2017-2022)
7.2 Europe User Virtualization Software Revenue (Value) by Vendors
7.3 Europe User Virtualization Software Revenue and Market Share by Type (2017-2022)
7.4 Europe User Virtualization Software Revenue and Market Share by Application (2017-2022)
8 Asia-pacific User Virtualization Software Market Size Categorized by Countries
8.1 Asia-pacific User Virtualization Software Revenue and Market Share by Countries
8.1.1 Asia-pacific User Virtualization Software Market Size by Countries (2017-2022)
8.1.2 China User Virtualization Software Revenue and Growth Rate (2017-2022)
8.1.3 South Korea User Virtualization Software Revenue and Growth Rate (2017-2022)
8.1.4 Japan User Virtualization Software Revenue and Growth Rate (2017-2022)
8.1.5 Australia User Virtualization Software Revenue and Growth Rate (2017-2022)
8.1.6 India User Virtualization Software Revenue and Growth Rate (2017-2022)
8.1.7 Southeast Asia User Virtualization Software Revenue and Growth Rate (2017-2022)
8.2 Asia-pacific User Virtualization Software Revenue (Value) by Vendors
8.3 Asia-pacific User Virtualization Software Revenue and Market Share by Type (2017-2022)
8.4 Asia-pacific User Virtualization Software Revenue and Market Share by Application (2017-2022)
9 South America User Virtualization Software Market Size Categorized by Countries
9.1 South America User Virtualization Software Revenue and Market Share by Countries
9.1.1 South America User Virtualization Software Market Size by Countries (2017-2022)
9.1.2 Brazil User Virtualization Software Revenue and Growth Rate (2017-2022)
9.1.3 Chile User Virtualization Software Revenue and Growth Rate (2017-2022)
9.2 South America User Virtualization Software Revenue and Market Share by Type (2017-2022)
9.3 South America User Virtualization Software Revenue and Market Share by Application (2017-2022)
10 Middle East and Africa User Virtualization Software Market Size Categorized by Countries
10.1 Middle East and Africa User Virtualization Software Revenue and Market Share by Countries
10.1.1 Middle East and Africa User Virtualization Software Market Size by Countries (2017-2022)
10.1.2 GCC Countries User Virtualization Software Revenue and Growth Rate (2017-2022)
10.1.3 Turkey User Virtualization Software Revenue and Growth Rate (2017-2022)
10.1.4 Egypt User Virtualization Software Revenue and Growth Rate (2017-2022)
10.1.5 South Africa User Virtualization Software Revenue and Growth Rate (2017-2022)
10.2 Middle East and Africa User Virtualization Software Revenue and Market Share by Type
10.3 Middle East and Africa User Virtualization Software Revenue Market Share by Application (2017-2022)
11 Global User Virtualization Software Market Segment by Type
11.1 Global User Virtualization Software Revenue and Market Share by Type (2017-2022)
11.2 Non-persistent VDI Revenue Growth Rate and Price
11.3 Persistent VDI Revenue Growth Rate and Price
12 Global User Virtualization Software Market Segment by Application
12.1 Global User Virtualization Software Revenue Market Share by Application (2017-2022)
12.2 SME (Small and Medium Enterprises) Revenue Growth Rate (2017-2022)
12.3 Large Enterprise Revenue Growth Rate (2017-2022)
13 Global User Virtualization Software Market Forecast
13.1 Global User Virtualization Software Revenue and Growth Rate (2022-2027)
13.2 User Virtualization Software Market Forecast by Regions (2022-2027)
13.2.1 North America User Virtualization Software Market Forecast (2022-2027)
13.2.2 Europe User Virtualization Software Market Forecast (2022-2027)
13.2.3 Asia-Pacific User Virtualization Software Market Forecast (2022-2027)
13.2.4 South America User Virtualization Software Market Forecast (2022-2027)
13.2.5 Middle East & Africa User Virtualization Software Market Forecast (2022-2027)
13.3 User Virtualization Software Market Forecast by Type (2022-2027)
13.3.1 Global User Virtualization Software Revenue Forecast by Type (2022-2027)
13.3.2 Global User Virtualization Software Market Share Forecast by Type (2022-2027)
13.4 User Virtualization Software Market Forecast by Application (2022-2027)
13.4.1 Global User Virtualization Software Revenue Forecast by Application (2022-2027)
14 Market Analysis
14.1.1 Market overview
14.1.2 Market Opportunities
14.1.3 Market Risk
14.1.4 Market Driving Force
14.1.5 Porter's Five Forces Analysis
14.1.6 SWOT Analysis
15 Downstream Market Analysis
15.1 Macro Analysis of Down Markets
15.2 Key Players in Down Markets
16 Research Findings and Conclusion
List of Tables and Figures
Figure Product Picture User Virtualization Software
Figure Bottom-up and Top-down Approaches for This Report
Figure Data Triangulation
Figure Part of Our External Database
Figure Key Executives Interviewed
Table Global User Virtualization Software Market Size (Million US$) by Type
Figure Global Market Share of User Virtualization Software by Type in 2021
Figure Non-persistent VDI Picture
Figure Persistent VDI Picture
Table Global User Virtualization Software Market Size (Million US$) by Application
Figure Global User Virtualization Software Market Share by Application in 2021
Figure SME (Small and Medium Enterprises) Picture
Figure Large Enterprise Picture
Table Global User Virtualization Software Comparison by Regions (M USD) 2017-2027
Figure Global User Virtualization Software Market Size (Million US$) (2017-2027)
Figure North America User Virtualization Software Revenue (Million US$) Growth Rate (2017-2027)
Figure Europe User Virtualization Software Revenue (Million US$) Growth Rate (2017-2027)
Figure Asia-pacific User Virtualization Software Revenue (Million US$) Growth Rate (2017-2027)
Figure South America User Virtualization Software Revenue (Million US$) Growth Rate (2017-2027)
Figure Middle East & Africa User Virtualization Software Revenue (Million US$) Growth Rate (2017-2027)
Table Business Impact Assessment - Covid-19
Table Market Trends and User Virtualization Software Potential Opportunities in the COVID-19 Landscape
Table Measures / Proposal against Covid-19
Table Global User Virtualization Software Revenue by Vendors (2017-2022)
Figure Global User Virtualization Software Revenue Market Share by Vendors in 2021
Table Global User Virtualization Software Vendors Market Concentration Ratio (CR5 and HHI)
Figure Top 5 User Virtualization Software Vendors (Revenue) Market Share in 2021
Figure Top 10 User Virtualization Software Vendors (Revenue) Market Share in 2021
Table Date of Key Vendors Enter into User Virtualization Software Market
Table Key Vendors User Virtualization Software Product Type
Table Ivanti Company Profile
Table User Virtualization Software Product Introduction, Application and Specification of Ivanti
Table User Virtualization Software Revenue (M USD) and Gross Margin of Ivanti 2017-2022
Table Ivanti Main Business
Table Ivanti Recent Development
Table Citrix Company Profile
Table User Virtualization Software Product Introduction, Application and Specification of Citrix
Table User Virtualization Software Revenue (M USD) and Gross Margin of Citrix 2017-2022
Table Citrix Main Business
Table Citrix Recent Development
Table Citrix Company Profile
Table User Virtualization Software Product Introduction, Application and Specification of Citrix
Table User Virtualization Software Revenue (M USD) and Gross Margin of Citrix 2017-2022
Table Citrix Main Business
Table Citrix Recent Development
Table AppSense Company Profile
Table User Virtualization Software Product Introduction, Application and Specification of AppSense
Table User Virtualization Software Revenue (M USD) and Gross Margin of AppSense 2017-2022
Table AppSense Main Business
Table AppSense Recent Development
Table Microsoft Company Profile
Table User Virtualization Software Product Introduction, Application and Specification of Microsoft
Table User Virtualization Software Revenue (M USD) and Gross Margin of Microsoft 2017-2022
Table Microsoft Main Business
Table Microsoft Recent Development
Table Vmware Company Profile
Table User Virtualization Software Product Introduction, Application and Specification of Vmware
Table User Virtualization Software Revenue (M USD) and Gross Margin of Vmware 2017-2022
Table Vmware Main Business
Table Vmware Recent Development
Table ProfileUnity Company Profile
Table User Virtualization Software Product Introduction, Application and Specification of ProfileUnity
Table User Virtualization Software Revenue (M USD) and Gross Margin of ProfileUnity 2017-2022
Table ProfileUnity Main Business
Table ProfileUnity Recent Development
Table Tricerat Company Profile
Table User Virtualization Software Product Introduction, Application and Specification of Tricerat
Table User Virtualization Software Revenue (M USD) and Gross Margin of Tricerat 2017-2022
Table Tricerat Main Business
Table Tricerat Recent Development
Table Mergers & Acquisitions Planning
Figure Global User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Global User Virtualization Software Revenue by Regions (2017-2022)
Figure Global User Virtualization Software Revenue Market Share by Regions in 2021
Figure North America User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Europe User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Asia-pacific User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure South America User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Middle East & Africa User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure North America User Virtualization Software Revenue and Growth Rate (2017-2022)
Table North America User Virtualization Software Market Size by Countries (2017-2022)
Table North America User Virtualization Software Market Share by Countries (2017-2022)
Figure North America User Virtualization Software Market Share by Countries in 2021
Figure United States User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Canada User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Mexico User Virtualization Software Revenue and Growth Rate (2017-2022)
Table North America User Virtualization Software Revenue by Vendors (2021)
Figure North America User Virtualization Software Revenue Market Share by Vendors in 2021
Table North America User Virtualization Software Revenue by Type (2017-2022)
Table North America User Virtualization Software Share by Type (2017-2022)
Table North America User Virtualization Software Revenue by Application (2017-2022)
Table North America User Virtualization Software Revenue Share by Application (2017-2022)
Figure Europe User Virtualization Software Revenue and Growth Rate (2017-2022)
Table Europe User Virtualization Software Market Size by Countries (2017-2022)
Table Europe User Virtualization Software Revenue Market Share by Countries (2017-2022)
Figure Europe User Virtualization Software Revenue Market Share by Countries in 2021
Figure Germany User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure UK User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure France User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Russia User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Italy User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Spain User Virtualization Software Revenue and Growth Rate (2017-2022)
Table Europe User Virtualization Software Revenue by Vendors (2021)
Figure Europe User Virtualization Software Revenue Market Share by Vendors in 2021
Table Europe User Virtualization Software Revenue by Type (2017-2022)
Table Europe User Virtualization Software Revenue Share by Type (2017-2022)
Table Europe User Virtualization Software Revenue by Application (2017-2022)
Table Europe User Virtualization Software Revenue Share by Application (2017-2022)
Figure Asia-pacific User Virtualization Software Revenue and Growth Rate (2017-2022)
Table Asia-pacific User Virtualization Software Market Size by Countries (2017-2022)
Table Asia-pacific User Virtualization Software Revenue Market Share by Countries (2017-2022)
Figure Asia-pacific User Virtualization Software Revenue Market Share by Countries in 2021
Figure China User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure South Korea User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Japan User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Australia User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure India User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Southeast Asia User Virtualization Software Revenue and Growth Rate (2017-2022)
Table Asia-pacific User Virtualization Software Revenue by Vendors (2021)
Figure Asia-pacific User Virtualization Software Revenue Market Share by Vendors in 2021
Table Asia-pacific User Virtualization Software Revenue by Type (2017-2022)
Table Asia-pacific User Virtualization Software Revenue Share by Type (2017-2022)
Table Asia-pacific User Virtualization Software Revenue by Application (2017-2022)
Table Asia-pacific User Virtualization Software Revenue Share by Application (2017-2022)
Figure South America User Virtualization Software Revenue and Growth Rate (2017-2022)
Table South America User Virtualization Software Revenue Market Size by Countries (2017-2022)
Table South America User Virtualization Software Revenue Market Share by Countries (2017-2022)
Figure South America User Virtualization Software Revenue Market Share by Countries in 2019
Figure Brazil User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Chile User Virtualization Software Revenue and Growth Rate (2017-2022)
Table South America User Virtualization Software Revenue s by Type (2017-2022)
Table South America User Virtualization Software Revenue Share by Type (2017-2022)
Table South America User Virtualization Software Revenue by Application (2017-2022)
Table South America User Virtualization Software Revenue Share by Application (2017-2022)
Figure Middle East and Africa User Virtualization Software Revenue and Growth Rate (2017-2022)
Table Middle East and Africa User Virtualization Software Market Size by Countries (2017-2022)
Table Middle East and Africa User Virtualization Software Sales Market Share by Countries (2017-2022)
Figure Middle East and Africa User Virtualization Software Sales Market Share by Countries in 2019
Figure GCC Countries User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Turkey User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure Egypt User Virtualization Software Revenue and Growth Rate (2017-2022)
Figure South Africa User Virtualization Software Revenue and Growth Rate (2017-2022)
Table Middle East and Africa User Virtualization Software Revenue by Type (2017-2022)
Table Middle East and Africa User Virtualization Software Revenue Share by Type (2017-2022)
Table Middle East and Africa User Virtualization Software Revenue by Application (2017-2022)
Table Middle East and Africa User Virtualization Software Revenue Share by Application (2017-2022)
Table Global User Virtualization Software Revenue by Type (2017-2022)
Table Global User Virtualization Software Revenue Market Share by Type (2017-2022)
Figure Global User Virtualization Software Revenue Market Share by Type in 2019
Figure Global Non-persistent VDI Revenue and Growth Rate (2017-2022)
Figure Global Persistent VDI Revenue and Growth Rate (2017-2022)
Table Global User Virtualization Software Revenue by Application (2017-2022)
Table Global User Virtualization Software Revenue Market Share by Application (2017-2022)
Figure Global User Virtualization Software Revenue Market Share by Application in 2021
Figure Global SME (Small and Medium Enterprises) Revenue Growth Rate (2017-2022)
Figure Global Large Enterprise Revenue Growth Rate (2017-2022)
Figure Global User Virtualization Software Revenue and Growth Rate (2022-2027)
Table Global User Virtualization Software Revenue Forecast by Regions (2022-2027)
Table Global User Virtualization Software Market Share Forecast by Regions (2022-2027)
Figure North America Revenue User Virtualization Software Market Forecast (2022-2027)
Figure Europe Revenue User Virtualization Software Market Forecast (2022-2027)
Figure Asia-Pacific Revenue User Virtualization Software Market Forecast (2022-2027)
Figure South America Revenue User Virtualization Software Market Forecast (2022-2027)
Figure Middle East & Africa Revenue User Virtualization Software Market Forecast (2022-2027)
Table Global User Virtualization Software Revenue Forecast by Type (2022-2027)
Table Global User Virtualization Software Market Share Forecast by Type (2022-2027)
Table Global User Virtualization Software Revenue Forecast by Application (2022-2027)
Table Global User Virtualization Software Market Share Forecast by Application (2022-2027)
Table Market Opportunities in Next Few Years
Table Market Risks Analysis
Table Market Drivers
Figure Porter's Five Forces Analysis
Table Macro Analysis of Down Markets
Table Key Players in Down Markets
Table Key Players of Downstream Markets
Figure Author List
Ivanti
Citrix
AppSense
Microsoft
Vmware
ProfileUnity
Tricerat