This document discusses various aspects of communication including: 1) The functions of communication such as controlling behavior, providing motivation, and releasing emotions. It also discusses the communication process and elements such as senders, receivers, channels, encoding, decoding and feedback. 2) Types of communication channels like formal/informal and different modes of interpersonal communication their advantages and disadvantages. 3) Barriers to effective communication such as filtering, selective perception, language differences and communication apprehension. It also discusses communication differences between cultures.