Video narration
Why can a phone number vanish in seconds, yet stay for years once you save it? Memory isn't one storage box. When you dial, you notice the number, keep it active while your fingers enter it, then save it as a contact. That sequence shows three systems. Sensory memory briefly registers what you see or hear. Working memory is your active mental workspace; it holds the number and uses it while you dial. Long-term memory keeps information for longer, sometimes for years. So forgetting isn't one failure. The number may never have been noticed clearly, may slip out while you use it, or may not be kept for later. This is a basic model, not the only way memory is classified. But think of memory as a relay, not a box: one system notices the number, one holds it while you dial, and one stores it for later.