Social proof is a psychological phenomenon where people conform to the actions and beliefs of a group in order to fit in and feel accepted. It is based on the idea that people believe the actions and opinions of others are an indicator of what is correct and acceptable.
Social proof is often seen in situations where people follow the lead of others, such as in fashion trends, consumer behaviour, and cultural norms. The more people are seen doing something, the more likely others are to do the same. Social proof is an important concept in marketing and advertising, as businesses often use it to influence consumer behavior.