Social motivation is the human need to interact with others and to be accepted by them.
Belongingness: The emotional need to be an accepted member of a group. Like wanting to feel part of the team.
The idea that we determine our own social and personal worth based on how we stack up against others. Like comparing your skills or performance with other players in the team.
The tendency to favor one's own group over outsiders. Like cheering for your own team even when they're not performing well.