Cinematography is like when someone is telling a story with a camera. You know how we can use our eyes to look around and see things? Well, a camera can do that too, and it can capture what it sees so people can watch it later. Cinematography is when someone is using the camera to tell a story in a special way, by choosing different ways to show things on the camera.
Imagine we're watching a movie about a little boy who goes on an adventure. The person who is in charge of cinematography might decide to use close-ups (when the camera is very close to someone's face) to show how the little boy is feeling scared or excited. They might also use wide shots (when you can see more of the picture) to show the little boy's surroundings and make us feel like we're right there with him.
Cinematography is also about choosing what colors to use, what kind of lighting to have, and where the camera should be placed. All of these choices can make a big difference in how the movie feels and what emotions it brings out in us.
So, cinematography is like a special storytelling tool that people use to make movies or TV shows more interesting, exciting, or scary.