3D games are video games that use 3-dimensional graphics to create a more immersive and realistic gaming experience. These games use advanced graphics engines to create a 3D environment that allows players to interact with the game world from multiple angles and perspectives. 3D games can be played on various platforms like PC, console, and mobile devices. Examples of popular 3D games include Grand Theft Auto V, The Last of Us Part II, and Red Dead Redemption 2.