How a propeller makes a boat move?

A propeller moves a boat by converting rotational energy from the engine into thrust. As the propeller blades spin, they create a difference in pressure between the front and back of the blades, pushing water backwards. This reaction generates forward motion due to Newton's third law of motion, where every action has an equal and opposite reaction. The design and angle of the blades also play a crucial role in optimizing efficiency and speed.