Whats a SERVO for a Rc Car ?

Question

Hi , im thinking of making my own rc car but first i want to know what the technicalities are so could someone please explain to me what a servo is in a simple but precise way ,

thanks

Answer 1

A servo is like a series of gears used to move specific parts like the wheels or an axel  

Answer 2

it's a little box with a cog on top, it's used to turn the rc or change gear or breaking, if you need to know what they look like go on e-bay type in rc servo loads will come up