What is a Motif?

In books and movies and television, have you ever noticed something that keeps showing up in the story? Perhaps it's a word or phrase that gets repeated over and over in a book, or an image or some other visual indicator that you keep seeing in a television show or movie. Either way, you've probably picked up on this intentional clue from the storyteller about the message they are trying to send you. You've discovered a motif.