This document discusses internal and external communication. It defines communication and lists its advantages. It explains the process of communication with a sender-receiver model. Internal communication occurs within an organization, while external communication is between an organization and outside parties. Effective communication requires considering the medium, whether it is one-way or two-way, and factors like speed and cost. Verbal, written and visual methods of communication are outlined along with their advantages and disadvantages. Barriers to effective communication are also addressed. Brief profiles of Havells India and Tata group discuss their use of internal and external communication in planning, transferring plans externally, and then reviewing internally.