The Cantor Function is a special type of math equation that maps one number (called the "input") to a different number (called the "output"). It's named after the German mathematician Georg Cantor, who first wrote down the equation. In its most basic form, the equation says that when you put in a number, the output you get will be the same number, but smaller. For example, if you put in 5, the output will be 4. If you put in 4, the output will be 3. And so on. That's why this equation is also sometimes called the "shrinking function"!