UGC NET Paper 1 GA 2015 June Solved Paper

Grapevine communication is informal workplace dialogue in its purest form, it is the spontaneous exchange of information between two or more persons at different status, specifically between employees and superiors, without adhering to any prescribed or official rules, formalities and chain of command in the organizational structure. Grapevine communication spreads rapidly and likely touches each person throughout the organization.
Vertical (Downward or Upward) and Horizontal communication are types of formal communication.