A car should have, at the very most, 3 separate pedals. On the far right, there's the gas pedal, which is also sometimes known as the accelerator pedal. When you press and depress the gas pedal, you're essentially actuating the throttle bodies. Thus, letting it know how much air and fuel to intake into the combustion chamber. The further down you press the gas pedal, the more air and fuel burns in the engine. Thus, it correlates with your car experiencing a boost of power. To the left of the gas pedal, there should be the brake pedal, which controls your car's brakes. If you have a manual transmission, there should also be a clutch pedal even further to the left.