C# (pronounced “C sharp”) is a modern, general-purpose, object-oriented programming language developed by Microsoft within its .NET initiative led by Anders Hejlsberg. C# is designed for Common Language Infrastructure (CLI), which consists of the executable code and runtime environment that allows use of various high-level languages on different computer platforms and architectures. C# is an evolution of the C and C++ family of languages and is related to Java. It is a simple, modern, general-purpose, object-oriented programming language.

C# is a strongly-typed language, which means that all variables must be declared with a specific type, and the compiler will enforce type safety. It also supports the concepts of inheritance, polymorphism, and encapsulation. C# supports garbage collection, which helps manage memory allocation and deallocation, as well as exception handling, which helps to detect and respond to runtime errors.

C# is a multi-paradigm language that supports both procedural and object-oriented programming. It is used to create Windows client applications, XML Web services, distributed components, client-server applications, database applications, and much more. It is also used to develop games using the Unity game engine and XNA framework.