ELI5: Explain Like I'm 5

Covering map

Okay, kiddo! Have you ever played "connect the dots"? You know, where you have to draw lines between the numbered dots to make a picture? Well, a covering map is kind of like that, but with shapes instead of dots.

You see, sometimes mathematicians like to study shapes that have lots of different ways you can look at them. These different ways of looking at the shape are called "views" or "perspectives". And a covering map is a special way to connect the dots, I mean shapes, between two different perspectives.

Let's say you have a big puzzle piece that fits into a puzzle with lots of other pieces. You could look at the puzzle piece from the top, right? But if you turn the piece around and look at it from the bottom, it might look like a totally different shape!

Now, imagine that you wanted to draw a picture of the top view of the puzzle piece and show it to someone else. But they only understand the shape of the puzzle piece from the bottom view. That's where the covering map comes in!

The covering map is like a magic lens that lets you turn the bottom view shape into the top view shape. It does this by connecting each point on the bottom shape to a corresponding point on the top shape. So, when you look through the covering map from the bottom view shape, you can see how it "covers" the top view shape.

It's kind of like having a map that shows you how to get from one place to another. Just like a map shows you which roads to take and where to turn, a covering map shows you how to "travel" between two different views of the same shape.

Cool, huh? Math is like a big puzzle, and sometimes we need special tools, like a covering map, to help us solve it!