Okay, imagine you're watching TV and there's a picture on the screen, but sometimes the edges of the picture get cut off or squished because your TV is a little different from other TVs. That's where the safe area comes in!
The safe area is like a special zone on the screen where important things, like people's faces or important details, should always be placed so that they don't get cut off or squeezed. This way, no matter what kind of TV you're watching on, you'll always be able to see the most important parts of the picture.
It's kind of like when you're coloring and you have to stay inside the lines so your picture looks nice and neat. The safe area is like the lines on the TV screen, helping make sure everything looks good no matter what kind of TV you're using.