A video wall is like a really, really big TV made up of many smaller TVs put together. It's like a puzzle where each puzzle piece is a TV. The TVs are set up in a certain way so they can all show the same thing at the same time, making one big picture. You can use a video wall to show movies, pictures or even watch TV shows. Imagine a giant wall where you can see everything really big and clearly - that's what a video wall is!