Clang is a compiler for the C, C++, and Objective-C programming languages. It is part of the LLVM project, which provides a collection of modular and reusable compiler and toolchain technologies. Clang is known for its fast compilation speed, excellent diagnostics, and support for modern language features. It is widely used in both open-source and commercial software development. One of Clang's key features is its ability to produce detailed error and warning messages, making it easier for developers to identify and fix issues in their code. Additionally, Clang supports various platforms and architectures, allowing developers to build applications for different environments efficiently.