Okay kiddo, so a photo-essay is when somebody takes pictures of something and then puts them in a story to help people understand what's going on.
Let's say you go on a trip to the park and you take pictures of all the fun things you did, like playing on the swings and having a picnic. You can put all those pictures together and make a special photo-essay about your day at the park.
When people look at your photo-essay, they can see all the different things you did and how much fun you had. It's a great way to tell a story with pictures instead of just words.
Photo-essays can be about all sorts of things, like a trip to the zoo or even a day in the life of your pet. They help us learn and understand things better by showing us pictures instead of just talking about them.