Retina Display is a type of screen display that makes things look really clear and sharp. It's like when you look at a picture and it looks blurry, but then you zoom in really close and everything looks super clear. That's what Retina Display does to everything on your screen - it makes everything look clear and sharp, even if you zoom in really close.
When you look at a regular screen, you can sometimes see tiny dots or pixels that make up the image. With Retina Display, the pixels are packed so tightly together that your eyes can't see them anymore. Instead, all you see is a smooth, clear image with no blurry or jagged edges.
This type of display was first introduced by Apple, and it's used in a lot of their devices like iPhones, iPads, and Mac computers. It's kind of like having a really fancy TV screen, but smaller and on your phone or computer.
So basically, Retina Display is just a really clear and sharp type of screen that makes everything look super nice and easy to see.