servo

A servo is a device that helps control and move mechanical parts, like robots' arms or car doors. You can also use it to mean someone or something that serves another person.

Think of a factory where machines are moving around on their own. Inside those machines, there's probably a servo working behind the scenes to make sure they operate smoothly. In this case, the servo is doing its job by helping control the machine's movements. Servos can be used in all sorts of things like elevators, wheelchair lifts, or even some toys that have moving parts. They're often small and hidden from sight but play a big role in making these devices work properly.