Examples of groups

Groups are a collection of people or things that share something in common. For example, animals can form a group. All the cats in a house can be a group, and all the dogs in another house can be a group. People can also form groups; for example, all the students in a classroom could be part of a group. Even things like rocks or pieces of food can be part of a group; for example, all the apples in a basket could be a group.