Grapevine communication is an informal network within an organization formed through social relationships rather than formal structures. It spreads throughout the organization in an unstructured way, carrying messages. Factors like uncertainty, lack of confidence, and favored groups can lead to more grapevine activity. The intensity of rumors on the grapevine depends on how important and ambiguous the information is. Common grapevine chains include single strands, gossip, probability, and cluster chains. While the grapevine can spread information rapidly and provide emotional support, it also risks spreading untruths and partial information. Managing the grapevine effectively includes keeping employees informed, encouraging participation, and discouraging harmful rumors.