Grapevine communication refers to the informal system of communication because it spreads throughout the organisation with its branches hello going out in all the directions without any regard to the level of authority. The different types of grapevine network are explained below:

a. Single strand network-Each person communicate with another person in sequence.

b. Gossip network-Each person communicates with another person on a nonselective basis.

c. Probability network-Each person communicates with another person randomly.

d. Cluster network- the individual communicates with only those people whom he trusts.