This document discusses various aspects of communication including what communication is, the communication process, types of communication, levels of communication, barriers to communication, and tools for effective communication. Communication is defined as the exchange of information, ideas, thoughts, feelings, and emotions through speech, signals, writing, and behavior. There are various types of communication including verbal communication, which uses words, and nonverbal communication, which uses body language and sounds. Communication occurs on different levels from intrapersonal communication within one's own mind to interpersonal, small group, one-to-group, and mass communication involving larger audiences. Barriers that can interfere with effective communication are also outlined.