C# (pronounced "C-sharp") is a versatile, object-oriented programming language developed by Microsoft. It's widely used for building Windows applications, web applications, and more. C# offers features like strong typing, automatic memory management, and a rich standard library. It's especially popular for creating desktop software and is also suitable for cross-platform development. Learning resources include Visual Studio, online courses, and community forums, making it accessible to both beginners and experienced programmers.