A sprocket is a wheel with teeth around the edge, used to make something else move, like a bicycle chain or a machine part.
Sprockets are often thought of as part of machines or bikes, and they help things move.
Examples:
The bicycle sprocket helps the wheels turn.
The machine needs a sprocket to work.
The sprocket is round and has teeth.
I wish I could eat a sprocket like a cookie!
The giant sprocket turned the whole city!
The sprocket is like a gear with teeth.