Carjacking

Carjacking, also known as motor vehicle theft, car theft or in the United States as Grand Theft Auto is a basic act in some action films, where characters possesses the ability to steal an occupied or unoccupied vehicle.

Stealing an Unoccupied Vehicle
If a vehicle is unoccupied, characters may simply break in, start the engine and drive/flee/ride away. But some road vehicles trigger an alarm when smashing the side window. However, hotwiring is sometimes seen in some films after entering into the unoccupied vehicle.

Stealing an Occupied Vehicle
If a vehicle is occupied by a driver, characters must pull the driver out of the vehicle by aiming at them with guns or just pull them out.

Grand Theft Auto term
Not to be confused with the video game franchise by Rockstar Games, the word "Grand Theft Auto" is an American term for vehicle theft. But not heard this much in most movies.