The Glasgow Haskell Compiler (GHC) is an open-source compiler for the Haskell programming language. It is known for its performance and extensive support for Haskell's features, including lazy evaluation and strong static typing. GHC is widely used in both academic and industrial settings, making it a key tool for Haskell developers. GHC provides various tools, such as a REPL (Read-Eval-Print Loop) for interactive programming and a package manager called Cabal for managing Haskell libraries. It also supports advanced features like type inference and concurrency, helping developers write efficient and robust software.