This document provides an overview of communication, including definitions of communication, the communication process, types of communication, and barriers to effective communication. It defines communication as the conveying or exchanging of information and ideas. The communication process involves a sender encoding a message, which is sent through a channel and decoded by the receiver. There is also feedback from the receiver. Communication can flow downward, upward, lateral, or diagonally within an organization. Barriers like noise, filtering, and psychological factors can interfere with effective communication.