Okay, so you know when you go to the beach and there are people who make sure you don't go too far out in the water? Well, that's kind of like what a captain of the port does. They're in charge of making sure that all the boats and ships in a certain area are safe and following the rules.
You know how you have rules for your toys and games at home? Like, maybe you can't play with certain things or you're not allowed to play too rough? That's kind of like what the captain of the port does with boats and ships. They have rules that everyone has to follow, and they make sure that everyone is playing by the rules.
The captain of the port also helps keep the waterways clean and protects the environment. They might make sure that ships aren't leaking oil or gas into the water, and that everyone is being careful not to harm any animals or plants in the water.
It's a really important job because it helps keep everyone safe and happy when they're out on the water. So, the captain of the port is kind of like a big boss who makes sure everything runs smoothly in their part of the ocean or waterway.