Garage is a map in BeamNG.drive, currently accessible only through the Garage button on the Main Menu.
It was added in the 0.6.0 update.
Garage is designed to modify and tune your cars in a realistic environment. It is currently only for visual purposes, but will later be used in upcoming Campaign and Story modes.
Garage used to be in the game as a freeroam map in some update, but is no longer freeroam.