Final answer:
A crowd is a gathering of people for short periods of time for various purposes, such as entertainment and business. Different types of crowds exist, including casual, conventional, expressive, and acting crowds.
Step-by-step explanation:
A gathering of people for short periods of time for entertainment, celebration, family, and business purposes is known as a crowd. It takes a fairly large number of people in close proximity to form a crowd. Examples of different types of crowds include casual crowds, conventional crowds, expressive crowds, and acting crowds. Casual crowds consist of people who are in the same place at the same time but who aren't really interacting, while conventional crowds are those who come together for a scheduled event that occurs regularly. Expressive crowds are people who join together to express emotion, often at funerals or weddings, and acting crowds focus on a specific goal or action, such as protests or riots.