Imagine you have a toy box with lots of toys inside. But, you can only see one toy at a time. If you want to see all the toys in the box together, you need to use more than one eye. That is what multiple-camera setup means.
Just like you have two eyes to see things in three dimensions, multiple-camera setup uses more than one camera to capture a wider and more realistic view of a particular scene. Some movies or TV shows may use multiple-camera setup to capture different angles of the same scene, which can then be edited together for a more interesting and varied viewing experience.
For example, imagine you are watching a football game on TV. The TV broadcast may use multiple cameras to show different views of the game, such as close-ups of the players, aerial shots of the field, and different angles of the ball in action. This makes the game more exciting to watch because you can see more of what's happening.
Overall, multiple-camera setup helps to capture a more complete and dynamic view of a particular scene, by using more than one camera to capture different angles and perspectives.