ELI5: Explain Like I'm 5

Sound-in-Syncs

When we watch movies or TV shows, we also hear sounds that go along with the things we see on the screen. These sounds might be people talking, music playing, or even the sound of a car driving by. When those sounds match up perfectly with what we see, we say that they are "in sync" or "in syncs."

Think about playing with a toy train set. You have the train tracks and toy trains that go on top of them. If you put a train on the track and turn it on, the wheels of the train will spin and it will start moving forward. If you put a sound of a train whistle on at the same time, it will sound like the train is really moving along the track.

Now imagine if you put the train on the track and turned it on, but the sound of the train whistle played a few seconds too early or too late. It wouldn't sound like the train was really moving along the track, and it would be very confusing for your ears!

Sound-in-syncs are important because they help us understand what's happening on screen. When we hear a character talking, we know what they're saying because the sound matches up with their mouth movements. When we hear a loud explosion, we see that explosion on screen at the same time.

So sound-in-syncs are like two parts of a whole: what we see on screen and what we hear matching up perfectly. That's what makes movies and TV shows feel real and exciting for us to watch and listen to!