A vehicle drivetrain is a system that transmits power from the engine to the wheels, enabling the vehicle to move. It includes several components such as the transmission, driveshaft, differentials, and axles. The drivetrain can be classified into different types, including front-wheel drive, rear-wheel drive, and all-wheel drive, depending on which wheels receive power. The transmission is a crucial part of the drivetrain, as it adjusts the engine's power to the wheels based on speed and load. Different vehicles may use various types of transmissions, such as automatic or manual. Understanding the drivetrain helps in comprehending how a vehicle operates and performs on the road.