A synchronizer is like a magic tool that helps movie editors match up the sound and picture in a movie.
You know how sometimes when you watch a video, the words don't match up with the person's mouth? Or maybe the sound effects don't happen at the right time? That can be really frustrating for viewers, and it can make the movie look unprofessional.
To fix that problem, movie editors use a synchronizer. It's kind of like a big machine that has two parts: a projector and a tape player. The projector plays the movie on the big screen, and the tape player plays the sound at the same time.
The editor can use the synchronizer to adjust the timing of the sound so that it matches up with the picture perfectly. They can speed it up or slow it down, or move it forward or backward in time. They can also use it to add sound effects, music or dialogue to the movie, making it more exciting or emotional.
The synchronizer is a really important tool for movie editors because it helps make the movie look and sound amazing to viewers like you and me!