Definition: Two or more individuals interacting with shared characteristics/interests.
Formation: Common ancestry, territorial proximity, or functional interdependence.
Group vs. Institution:
Group: Temporary, collection of people.
Institution: Permanent, functioning entity (e.g., family, government).
Social Aggregates: People in the same place/time (e.g., bus queue).
Collectivity: State of being in a group.
Social Category: Shared social traits (e.g., "elderly").
Primary Group:
Small, intimate, frequent interaction (e.g., family, friends).
Secondary Group:
Large, impersonal, goal-oriented (e.g., corporations, nations).
Reference Group:
Influences behavior/attitudes (e.g., in-group [fraternities] vs. out-group).