Decoupling is when we use some special parts called "capacitors" to help protect our electronics from getting messy and confusing signals.
Imagine you are at a big party with lots of people talking at once. It can be hard to hear just one person clearly. That's kind of what happens inside electronics when there are lots of different signals (or voices) happening at the same time.
But, just like how you might put your hands over your ears to block out some of the noise at a party, electronics use capacitors to block out some of the confusing signals. A capacitor is like a little tank that can hold extra energy. When there is too much signal "noise" happening, the capacitor can absorb it and keep things more organized.
So, when we "decouple" electronics, we are adding these special capacitors to keep the signals from getting too messy and confusing. This helps keep all the different parts inside the electronics working together smoothly and efficiently.