Okay, imagine you are at a big party with lots of people. Now, if you want to see everything, standing on a horse would be great because they are tall! Horses can go through small spaces where cars can't fit, like between people or by benches.
When officers ride horses, it's easier for them to look around and make sure everyone is safe. They can go places where cars might get stuck or wouldn't be able to go, like on a bumpy park path or in a busy crowd. So, horses are very special helpers that can go where cars can’t!