A lighthouse keeper is like a person who takes care of a very special type of tall building that helps boats not get lost or crash into rocks in the ocean. Imagine a really big flashlight that shines light all around in the dark so ships can see where they are going.
The lighthouse keeper lives inside the tall building and has a special job to turn on and off the light every night so that boats can see it. They also keep the building very clean and tidy, and make sure everything works properly. They might have to climb up and down a lot of stairs to get to the light at the top, so they need to be very strong and careful.
The lighthouse keeper needs to know a lot about the ocean and the weather patterns, so they can use their special telescope to see if there are any boats coming or any bad storms. They might need to call for help if a boat is in trouble. The lighthouse keeper is very important because they help keep the boats and the people traveling on them safe.