Why do people come together in groups? what does a group give to a person?

Humanity has overcome a long stage of development, which has proved that in a community it is much easier to manage and survive. Initially, the ancient representatives of the human race rallied in groups in order to hunt and defend themselves from animals. Later they began to conduct a joint household, while expanding their ties with other people. In the modern world, society is the conditions for human socialization. Groups are people with common interests or a common occupation, which allows you to get the job done more efficiently.