Okay kiddo, have you ever watched a video or a movie on your computer or TV and noticed that the pictures are not really smooth? Like they are shaking or tearing apart?
That's because the monitor (screen) and the computer or TV are not talking to each other properly. They are not synchronized.
Imagine you and your best friend are dancing together. If you both dance at different speeds, then it will be difficult for you to have a great time. The same thing happens with your computer and monitor.
To fix this problem, they need to synchronize with each other so that they can dance together perfectly. This process is called monitor synchronization.
It means that your monitor and computer or TV are working together to show you smooth and clear pictures. So, next time you watch a video or play a game, remember that synchronization is important for a great experience.