How does this golf cart work?

I went golfing and the golf carts they let us drive are very interesting. I think they are gas powered but the engine does not stay running.

Somehow when you hit the gas pedal the engine goes and when you let off the engine stops.

How does this work? I dont understand how it can go on and off like this.

The crazy thing about it is it goes instantly when you hit the gas there is no delay to wait for it to start.

Anybody know?

Thanks.

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