what does a transmission do in a car?

Depending on the purpose, it is necessary to satisfy various conditions such as increasing the force to transmit the tire, changing the rotation speed of the tire, and reversing the direction of rotation. However, because the engine’s ability alone cannot satisfy the required conditions, it is necessary to have a device that allows the conditions to be satisfied within the capabilities of the engine. Transmission is a device that transmits rotation (torque and speed) from the engine by changing the speed and direction of rotation according to the gear selected.