The largest cruise ships are like floating towns carrying thousands of people.
The biggest can hold more than 5,000 travellers. They even have pools, parks and shops on board.
More facts about Water Vehicles
Boats float on top of the water and carry people across rivers.
Big ships carry cars, food and toys across the ocean to other countries.
Submarines can dive deep down under the water.
Sailboats use the wind to push their big sails and move along.
Ferries carry people and cars across the water to the other side.