Okay, kiddo. So lower third is like the name tag for people on TV or videos. It's a little strip at the bottom of the screen that tells us who is talking or what the topic is. Like when you watch a news channel, the name of the reporter and what they're talking about will be written at the bottom so you know who and what you're watching. Lower third is just to make it easy for us to follow what's happening on TV or videos without getting confused. It's like a helpful signpost!