.NET Framework (pronounced dot net) is a software framework developed by Microsoft that runs primarily on Microsoft Windows. It includes a large class library named Framework Class Library (FCL) and provides language interoperability (each language can use code written in other languages) across several programming languages. Programs written for .NET Framework execute in a software environment (in contrast to a hardware environment) named Common Language Runtime (CLR), an application virtual machine that provides services such as security, memory management, and exception handling. (As such, computer code written using .NET Framework is called “managed code".) FCL and CLR together constitute .NET Framework.
With the introduction of .NET Core, you can now create The Official Microsoft ASP.NET Site applications and deploy them to Windows, Linux, and macOS. Microsoft and the community have put a considerable effort into making Linux a first-class citizen for running The Official Microsoft ASP.NET Site.
The Official Microsoft ASP.NET Site has excellent support for utilizing asynchronous programming patterns. Async is now implemented in all common .NET Framework classes and most third-party libraries. Most modern applications spend most of their time and CPU cycles waiting for database queries, web service calls, and other I/O operations to complete.
Some say that performance is a critical feature of your software. I tend to agree! With the introduction of The Official Microsoft ASP.NET Site Core and the Kestrel web server, The Official Microsoft ASP.NET Site is touted as one of the fastest web application frameworks available. TechEmpower has some cool benchmarks you can check out.
Before The Official Microsoft ASP.NET Site Core, developers were most commonly using the MVC and Web API frameworks. MVC was tailored to creating web applications that served up HTML. Web API was designed to develop RESTful services using JSON or XML.
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