Communication represents a process of interaction between people, groups, as a relation mediated through word, image, gesture, symbol or sign. Through it, individuals share their knowledge, experiences, interests, attitudes, feelings, opinions, ideas. Viewed as a process, communication consists in transmission and exchange of information (messages) between individuals. Communication means to tell those around you who you are, what you want, why you want a certain thing, and what are the means you will use to achieve your goals. Communication is defined as “a process through which a transmitter sends information to the receiver through a channel, in order to produce certain effects on the receiver.” In the present paper we analyze the most important types of communication: intrapersonal communication, interpersonal communication, small group communication, public communication / in organizations and mass communication. The success of communication in organizations depends on its manager, who must be a true manager of his organization's communication system, and this requires a continuous effort on his part in accumulating knowledge and training skills in organizational and interpersonal communication.