Digital signature

A digital signature is like a real-life signature but it's done on a computer. You use it to tell people that it's really you who is signing something, and it can't be faked. It works by encrypting a message (like a document of text) with a special code that you make. That code is like a fingerprint that only you know about, so everyone has a different code. When other people get your message, they can use your code to make sure that it really came from you and no one else.