Low Level Virtual Machine (LLVM) is a collection of modular and reusable compiler and toolchain technologies that provide support for a variety of programming languages. LLVM enables developers to create robust, optimized, and efficient software applications by providing a framework for code generation and optimization. It includes tools for code analysis, profiling, and debugging, making it a comprehensive solution for software development. LLVM is open-source, making it accessible for developers to contribute and extend the technology.