What is .NET?

.NET is the development platform used by millions of developers to create apps and
services on any device and OS, with amazing performance and great developer
productivity.
 
Performance
.NET is fast. Really fast. Device applications for Windows, iOS and Android run
natively so you can create rich and fluid apps that use all the device capabilities. On
the server side, .NET Core is breaking records and performs faster than any other
popular framework. That means applications provide better response times and
require less compute power.
Productivity
.NET helps you develop high quality, professional applications faster. Modern
language constructs like generics, Language Integrated Query (LINQ), or async
support will make you productive in common application scenarios such as multi-
threading or data. Combined with the extensive class libraries and the powerful
tooling provided by the Visual Studio family, .NET is the most productive platform
for developers.