Okay, so telop is a fancy word for text that appears on TV or in videos. You know how sometimes when you're watching a show or movie, there are words on the screen that tell you what people are saying, even if it's in a different language? That's telop!
It's kind of like subtitles for hearing-impaired people, but it can also be used for other things like explaining what's going on in a scene or giving extra information. Telop can be in different colors, sizes, and fonts, and it's usually at the bottom of the screen.
So, next time you're watching something and you see words on the screen, just remember it's called telop!