Word of mouth refers to the informal sharing of information, opinions, or recommendations between individuals through personal conversations and interactions. This type of communication can be highly influential, as it is based on personal experiences and trust. It is a common way for people to make decisions about products, services, or experiences, as they rely on the opinions and recommendations of those they know and trust. Word of mouth can have a significant impact on a company's reputation and can drive sales, making it an important aspect of marketing and brand building.