Communication is a systematic and continuous process of telling, listening and understanding the official information. There is internal and external communication.
The act of exchanging information between the people and departments inside the organization is called internal communication.
Internal communication can be divided into downward, upward and lateral communication.
The act of exchanging information between individuals and offices outside the information between two offices or organizations is called external communication.
Oral communication, written communication and symbolic communication are three types of external communication.