Grapevine can be described as the circulation of rumours and unofficial information. As a result, grapevine refers to an informal and unauthorized intra-organizational communication channel.
Informal communication channel refers to an unofficial and unstructured channel of communication that is not specified by the organization but exists due to the personal and social demands of employees. Informal information is not official and could be nothing more than murmurs or gossip.
Therefore, gossip and rumor in an organization are part of the grapevine, which itself is a type of informal communication channel.
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