Okay kiddo, do you know what a voltage is? It's like the strength of the electricity flowing through something. Sometimes we need to make sure the strength of the electricity is just right for whatever we're using it for. That's where a voltage regulator module comes in.
A voltage regulator module is a little device that makes sure the strength of the electricity going to something is just right. It's kind of like a traffic cop for electricity. It tells the electricity when to slow down and when to speed up so everything works smoothly.
Usually, these modules are used to make sure electronics don't get too much or too little electricity. Just like how you need the right amount of water to grow a plant, electronics need the right amount of electricity to work properly. A voltage regulator module helps make sure that happens.