Stop-time is when time seems to stop moving forward. Imagine playing a game of tag with your friends and suddenly someone yells, "STOP!" and everyone freezes in place. That's like stop-time.
Sometimes, stop-time happens in movies or TV shows when something really important is about to happen. The camera will focus on one person or object and everything else in the scene will seem to freeze. This helps create a sense of suspense or drama.
In real life, stop-time doesn't actually happen. Even when we sleep, time keeps moving forward. So whenever you feel like time is standing still, it's just your perception of it.