What car brand is the most sold in the world?

Toyota.

The biggest car COMPANY in the world is GM, but they only have about fifty brands of cars, including Chevrolet, Buick, Pontiac, Holden, Opel...it's kinda hard to be the "most sold brand" when your company's brands are regional. Every country sells Toyota cars. the most sold car in the history of cars is the Toyota corrola!!!!!