Scotch tape is a kind of sticky tape that you can use to stick things together. It's called "Scotch" tape because it was invented in Scotland a long time ago. The tape is made of a thin piece of plastic that has glue on one side. When you peel off the back paper, you can stick the tape to things like paper or cardboard.
Sometimes when you're making a craft project, you might need to cut a piece of tape to the right size. But be careful, because the tape can stick to itself and become hard to use! Once you've stuck the tape to something, it can be hard to remove without leaving a sticky residue. But if you ever need to take it off, you can try using some rubbing alcohol or a special kind of adhesive remover.
So, in short, Scotch tape is a sticky kind of tape that you can use to stick things together. Just be careful when you're using it, and try to avoid getting it stuck where you don't want it!