Communication involves both a sender transmitting a message and a receiver receiving it. Effective communication is important for maintaining good relationships. There are three main styles of communication: passive, aggressive, and assertive. Passive communication avoids conflict but does not express one's needs. Aggressive communication disrespects others to get what it wants. Assertive communication respects both parties and finds a compromise. The document provides examples of how each communication style appears physically and the typical beliefs and emotions associated with it.