This document outlines 5 types of communication environments: intrapersonal, interpersonal, small group, public, and mass communication. Intrapersonal communication occurs within oneself through thinking. Interpersonal communication happens between a few people who know each other uniquely. Small group communication takes place among 3 to 15 people with shared goals and open communication. Public communication is for groups of 15 or more people sharing the same interests. Mass communication distributes messages through transmitted devices like TV, radio, and newspapers.