An 'electric bike', like a bike where you still have to cycle / pedal yourself, but it accelerates. So you either have to put in less effort to get the same speed, or you go faster with the same effort you'd use on a normal bike.

It's not like a motorcycle or scooter where you don't have to do anything. If you don't do anything, the e-bike doesn't do anything either. You could also see it as a bicycle, still driven on human power, but with mechanical acceleration. It doesn't go extremely fast though, but it's still faster (and more convenient) than regular bikes.