This document reviews key aspects of the communication process including definitions, purposes, models, types, barriers and techniques for effective communication. It defines communication as the exchange of ideas, facts, beliefs, feelings or impressions to reach a common understanding. The purposes of communication include exchanging ideas, influencing behavior, building relationships and providing information. The document outlines verbal communication, non-verbal communication, one-way communication, two-way communication and formal/informal communication. It also discusses barriers like muddled messages and lack of feedback, and techniques to improve communication skills like active listening, maintaining eye contact and using silence strategically.