An auto-throttle is a system used in aircraft to automatically control the engine power settings. It adjusts the throttle position based on various factors, such as altitude, speed, and flight conditions, ensuring optimal performance and fuel efficiency. This system helps pilots maintain the desired speed without constant manual adjustments. In addition to aviation, auto-throttle technology is also found in some automobiles and marine vessels. By automatically regulating engine power, it enhances safety and comfort, allowing drivers and operators to focus on other critical tasks while maintaining control over their vehicle's performance.