A president is like the captain of a really big boat called a narrowboat. The narrowboat is a flat and slim boat that travels on a very narrow canal filled with water. The president is like the boss of the boat, and they make important decisions about where the boat will go and what it will do while on the canal. They also make sure that everyone on the boat is safe and having fun. Sometimes, the president will even let other people help steer the boat or give them a tour of the canal. Overall, the president is the person in charge of the narrowboat, and they make sure that the boat runs smoothly and everyone has a good time.