The Edinger-Westphal nucleus is a group of special brain cells that help control some important parts of the body like the eyes. You can think of it like a group of superheroes with special powers to help you see better.
These superhero cells are located deep inside your brain, kind of like a secret hideout. They talk to other parts of your brain and help control your pupils (the black part in the center of your eye), which can grow bigger or smaller depending on how bright the light is. These superhero cells also help control the muscles in your eyes that let you focus on objects near or far away.
So when you're reading a book, watching TV or looking at something interesting, the Edinger-Westphal nucleus is helping your eyes do all of those things. It's like they're your own personal eye-control center in your brain.
So next time you see something really cool or bright, remember that your Edinger-Westphal nucleus is right there helping you see it!