Final answer:
Collective behavior is non-institutionalized activity where people voluntarily engage. There are three types of collective behavior: crowd, mass, and public. Theories on collective behavior emphasize social norms, preconditions, and collective action.
Step-by-step explanation:
Collective behavior refers to non-institutionalized activity in which several people voluntarily engage. It is any group behavior that is not mandated or regulated by an institution. There are three main forms of collective behavior: crowd, mass, and public. Theories on collective behavior include the emergent-norm perspective, which emphasizes the importance of social norms in crowd behavior; the value-added theory, which states that several preconditions must be in place for collective behavior to occur; and the assembling perspective, which focuses on collective action and various categories of gatherings.