An e-bike normally comes with the Pedal assist and throttle mode. The throttle mode lets the motor do the business where you only need to give the initial push. The Pedal Assist provides power from the motor to help you pedal easier. When you turn on pedal assist and choose your level of assist, the motor will provide a certain level of power output as you pedal. This may feel like a slight push as you ride. The sole difference between these two is that in pedal-assist mode, you need to pedal the bike, but with less force whereas on the throttle mode, the motor does it for you.