What is the main function of the throttle body in an engine?

The primary function of the throttle body is to control the amount of air that enters the engine's intake manifold. This component plays a crucial role in regulating engine power and performance by determining how much air is available for combustion. The throttle body is typically connected to the accelerator pedal through a linkage or electronically in modern engines. When the driver presses the pedal, the throttle body opens to allow more air in, which increases engine power output in response to the driver's demand. In this manner, it serves as an essential part of the air intake system, directly influencing the engine's efficiency, power, and responsiveness.