Okay kiddo, do you know what an oscillator is? It's something that goes back and forth repeatedly like a swing or a clock pendulum. A chemical oscillator is kind of like that, but instead of swinging, it's a chemical reaction that happens over and over again.
Imagine you have two chemicals in a jar, let's call them A and B. When you mix them together, they react and make a third chemical, which we'll call C. But then, after a little while, the C chemical starts to react with the A chemical and turns it into B again! This makes the mixture turn back into A and B, and then it starts all over again.
This cycle keeps repeating, with the chemicals going back and forth between A and B and making C in between. And the coolest part is that this cycle happens all by itself, without any outside help. It's like a little chemical machine that just keeps on running.
Scientists study chemical oscillators because they can give us clues about how chemical reactions work and how they can happen without any outside interference. Plus, it's just really cool to watch these reactions happen over and over again!