Word of mouth is the passing of information by verbal means, especially recommendations, but also general information, in an informal, person-to-person manner, rather than by mass media, advertising, organized publication, or traditional marketing. Word of mouth is typically considered a spoken communication, although web dialogue, such as blogs, message boards and emails are often now included in the definition.
Word of mouth promotion is highly valued by marketers. It is felt that this form of communication has valuable source credibility. People are more inclined to believe word of mouth promotion than more formal forms of promotion because the communicator is unlikely to have an ulterior motive (ie.: they are not out to sell you something). Also people tend to believe people that they know. In order to manufacture word of mouth communications, marketers use publicity techniques. See Word of mouth marketing.
There is some overlap in meaning between word of mouth and the following: rumour, gossip, innuendo, and hearsay; however the negative connotations of these words are not included in the meaning of word of mouth. See also grapevine.
See also: Word of mouth marketing
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