A punt is a long, narrow, flat-bottomed boat that people use to move along shallow waters like rivers or ponds. It is usually made of wood or fiberglass and is pushed along with a long pole, called a punt pole.
Imagine you are playing with a toy boat in a small pool. You can push the boat with your hands and it moves forward. Now imagine the pool is bigger, and you can't reach the bottom anymore to push it with your hands. You need a longer stick to push the boat. That's what a punt pole does. The person in the boat pushes the pole against the bottom of the water, and this pushes the boat forward.
Punts are often used by people who want to relax and enjoy the scenery while they travel on the water. It's a peaceful way to see nature up close. Some people also use punts to fish or to transport goods like food and supplies.
So just like your toy boat needs your hands to push it in a small pool, a punt needs a person and a long pole to move it along in bigger water.