C# (pronounced "C-sharp") is a modern, object-oriented programming language developed by Microsoft as part of the .NET framework. It is designed for building a wide range of applications, from web and desktop to mobile and gaming applications, using a simple and powerful syntax. C# supports features such as garbage collection, type safety, and rich libraries, making it a versatile and efficient language for developers. It is widely used in enterprise environments and for developing Windows applications, as well as with cross-platform frameworks like .NET Core for applications that run on multiple operating systems.