So, imagine you're playing with a toy and you suddenly touch a metal part that gives you a little shock. That's kind of like what a zap is. But in technology, a zap is like a super quick "electric shock" that helps two different things talk to each other. For example, if you have a phone app that needs to connect to your email account, you might need to "zap" them together so they can share information.
It's called a "zap" because it happens really fast, like a tiny lightning bolt that helps make things work better.