Cairo is a program that helps people draw things on the computer. Imagine you have a big white piece of paper and you want to draw a picture on it. You can use different colored pencils or paint to make your drawing look nice.
Just like that, Cairo helps you draw things on your computer screen using different colors and shapes. You can draw lines, circles, rectangles, and other cool shapes. You can make them bigger or smaller, change their color, and even make them move around!
Cairo helps you make your drawings look really pretty and smooth, so it's a great tool for artists and designers who want to make things on the computer. It's like having a magic colored-pencil set that never runs out of ink!