Collective behavior is the spontaneous, unstructured, and temporary actions of a group of people in response to a specific situation or event. It is characterized by a shared sense of purpose or emotion among participants.
Organized efforts by a large group of people to achieve or prevent change in society over an extended period.
Mass Hysteria: A phenomenon where collective illusions of threats, real or imaginary, spread through a population in society as a result of rumors and fear.