Universal set

Okay kiddo, imagine you have a box where you keep all your toys. This box can be your universal set for today. So, a universal set is just a big box that contains everything you need to solve a problem or talk about a topic.

For example, let's say you want to talk about animals that live in the forest. Your universal set will contain all the animals that you can find in the forest like deer, bears, squirrels, and birds. But if you want to talk about animals that live in the sea, then your universal set will contain creatures that live in the sea like fish, turtles, and sharks.

So basically, a universal set is a collection of all the possible things that you want to talk about or use to solve a problem. And just like your toy box, it can contain anything you need to play and have fun!