What is caster?

Caster is like a super-smart helper who can make things move on their own, just by thinking about it.

Imagine you have a toy car that can drive by itself, no one pushing it, no strings attached. That’s what caster does in some machines and toys. It's kind of like having a brain inside the wheels or the moving parts that tells them how to go where they need to be.

Think about your skateboard. When you push off and start rolling, it keeps going smoothly, almost like it wants to keep moving on its own. That’s because of something called caster in the wheels. It helps the wheels stay aligned and move easily, making it feel like the board knows where it wants to go.

In some toy cars or robots, caster is like a hidden helper that makes them turn and roll smoothly without you having to push them all the time. It's just doing its job quietly in the background, kind of like how your legs help you walk without you thinking about it.