The pronoun "vous" is a second-person plural pronoun in the French language. It is used to address multiple people or to show respect when speaking to one person. "Vous" is often used in formal situations, such as in business or when meeting someone for the first time. In contrast to the informal "tu," which is used among friends and family, "vous" helps maintain a level of politeness. Understanding when to use "vous" is essential for effective communication in French culture and can influence social interactions positively.