The throttle body is a component found in carbureted engines, which means it's not present in fuel-injected vehicles. It's essentially an air intake system that mixes air and fuel before sending them into the engine's cylinders. The throttle body consists of a butterfly valve or slide mechanism that opens or closes to regulate the amount of air entering the engine, thereby controlling the power output. In essence, it is what allows you to control the speed and acceleration of your car by adjusting the position of the throttle.