LLVM Clang is a compiler front end for the C, C++, and Objective-C programming languages that translates source code into LLVM Intermediate Representation (IR) for further compilation and optimization. As a key component of the LLVM compiler infrastructure, Clang is widely used in the tech community for building compilers, debuggers, and other development tools, offering features like fast compilation, modular design, and diagnostic reporting, making it a popular choice among developers and a crucial tool for programming and software development.