Garry's Mod (officially abbreviated to GMod) is a sandbox physics game that allows the player to manipulate objects and experiment with physics using the Source engine. Garry's Mod has been available on Steam's content delivery service since November 29, 2006. rnDespite being a standalone game, Garry's Mod requires the user to own at least one game on Steam based on the Source engine, such as Half-Life 2, Counter-Strike: Source, Portal 2, or Team Fortress 2.
It is also commonly used for the creation and publishing of videos on YouTube, mainly from Team Fortress 2, Half-Life 2, Portal and Left 4 Dead.
You need a Pentium 4 1.8GHz or Athlon XP 1600+ processor coupled with a GeForce 6800 XT to run Garrys Mod system requirements at recommended. You can expect to get around 60FPS at 1080p screen res on high graphics settings with this hardware. System memory required for Garrys Mod is 1 GB performance memory. Recommended needs around a 14 year old PC to run.