"Jam sync" is like when you and your friends are playing a game of hide-and-seek, and you all say "ready, set, go" at the same time to start counting. Jam sync is when different machines, like cameras, audio recorders, or computers, all want to keep track of time together.
They need to do this so that they can work together to make a movie, record music or a podcast. Imagine if one camera was recording at a different time than another camera. The movie would look like it was jumping around and not be smooth.
With jam sync, one device sends out a special signal, like a whistle, and all the other machines listen and know to start counting time from that moment. This helps make sure that all the different devices are recording at exactly the same time.
In summary, jam sync is like everyone saying "ready, set, go" at the same time to keep track of time and make things work well together.