Throttle control refers to the regulation of the engine's power output in vehicles, typically managed by the accelerator pedal. When a driver presses the pedal, it opens the throttle valve, allowing more air and fuel into the engine, which increases speed. Conversely, releasing the pedal reduces the engine's power, slowing the vehicle down. In modern vehicles, throttle control can be electronic, using sensors and actuators to manage engine performance more precisely. This system, often referred to as drive-by-wire, enhances fuel efficiency and reduces emissions by optimizing the engine's response to the driver's input.