dot product

The dot product is sort of like trying to see if two things are the same. It's kind of like the game "Memory" where you have to match two cards. The dot product takes two sets of numbers, like an address or a list of ingredients, and tries to find the same numbers (if they have them). If they do have the same numbers, it adds them up to give you a result. That result can be used to tell if the two sets are the same or if they are different.