Garry's Mod is a sandbox video game created by Garry Newman and released in 2006. It is built on the Source engine, which powers other popular games like Half-Life 2 and Counter-Strike. Players can manipulate objects, create their own game modes, and use various tools to build and experiment in a virtual environment. The game does not have a specific objective, allowing players to explore their creativity. Users can download and share content through the Steam Workshop, including maps, models, and game modes. This flexibility has made Garry's Mod a popular platform for both casual and dedicated gamers.