What are two groups?

Two groups are two sets of things or people that are together but separate, like two teams playing a game.

Imagine you're at the playground with your friends, and you split into two teams for a game of tag. One team is wearing blue shirts, and the other is wearing red shirts. The blue group is one team, and the red group is the other team. They’re both playing the same game, but they're different because of their colors.

Now imagine you have a jar full of cookies, and you divide them into two piles: one pile has chocolate chip cookies, and the other has sugar cookies. The chocolate chip group is one bunch, and the sugar cookie group is the other bunch. They’re both cookies, but they're different kinds, just like two groups!