A vehicle drivetrain is the mechanical system responsible for transmitting power from the engine to the wheels, enabling vehicle movement. It typically includes components like the engine, transmission, driveshaft, and differentials. The engine generates power, which is transferred to the transmission, allowing for speed and direction control. The transmission can be automatic or manual and selects the appropriate gear for optimal performance. The driveshaft transmits power to the axles, which then distribute it to the wheels. Drivetrains can be front-wheel drive, rear-wheel drive, or all-wheel drive, each offering distinct advantages in terms of traction and handling.