SHA256 stands for Secure Hash Algorithm 256. It is a type of computer code that creates a unique string of characters from the information you give it. For example, if you have a sentence "I love cats", the SHA256 algorithm would turn it into something like this: 5994471abb01112afcc18159f6cc74b4f511b99806da59b3caf5a9c173cacfc5. This is called a "hash". The important thing to remember is that the same sentence will always give you the same hash, and any change in the sentence will give you a different hash. Think of it like an ID number for each sentence.