Interference theory is one of the theories that explain how we remember and learn things. It suggests that when we store something in our memory, it can be interfered with by other information. For example, imagine you're learning a song. You might practice it over and over until you remember it. But if someone starts singing a different song while you're trying to learn the first song, it might interfere with your memory and make it harder to remember the first one. That's interference theory.