.NET Framework is a comprehensive software development framework. It provides a unified platform for building and running applications on Windows. .NET supports multiple programming languages, including C#, VB.NET, and F#, allowing developers to choose the language that best suits their needs. The framework includes a Common Language Runtime (CLR) for managing code execution and a rich class library that simplifies common programming tasks. With features like memory management, security, and interoperability, .NET Framework empowers developers to create a wide range of applications.