A speedboat is a small boat with a powerful engine that can go very fast on the water.
Speedboats are exciting and fun. They are often used for racing or for going fast on the water.
Examples:
The speedboat raced across the lake.
I want to ride in a speedboat.
The speedboat is very fast.
The speedboat is faster than a big ship.
The speedboat zoomed across the water like a rocket.
I saw a red speedboat go really, really fast.