.NET programming is a software development framework created by Microsoft, designed to build applications for Windows, web, mobile, and cloud platforms. It provides a versatile environment for developers, supporting multiple programming languages such as C#, VB.NET, and F#. The framework includes a large class library and runtime environment, called the Common Language Runtime (CLR), which handles application execution. .NET is widely used for creating enterprise-level applications, web services, APIs, and modern web applications with technologies like ASP.NET, Blazor, and Xamarin. Its cross-platform capabilities, especially with .NET Core, enable developers to create high-performance, scalable applications across various operating systems.