The history of communication dates back to the first human interactions. Cavemen communicated feelings of anger, friendship and fear with one another mostly by body language and signs. Throughout time, the ability of people to communicate with each other has progressed. Across language barriers and over vast distances messages have needed to be conveyed using various forms of communication.
As the dictionary define communication as the act or process of communicating; fact of being communicated. The imparting or interchange of thoughts, opinions, or information by speech, writing, or signs.( http://dictionary.reference.com/browse/communication) Let’s look upon the description of other authors and groups about communication.
"Any act by which one person gives to or receives from person information about that person's needs, desires, perceptions, knowledge, or affective states. Communication may be intentional or unintentional, may involve conventional or unconventional signals, may take linguistic or nonlinguistic forms, and may occur through spoken or other modes." (National Joint Committee for the Communicative Needs of Persons with Severe Disabilities, 1992, p. 2)
"A communication takes place when one individual, a sender, displays, transmits or otherwise directs a set of symbols to another individual, a receiver, with the aim of changing something, either something the receiver is doing (or not doing) or changing his or her world view. This set of symbols is typically described as a message."
William Rice-Johnson
"Communication is the exchange and flow of information and ideas from one person to another; it involves a sender transmitting an idea, information, or feeling to a receiver."
U.S. Army
"To effectively communicate, we must realize that we are all different in the way we perceive the world and use this understanding as a guide to our communication with others."
Tony Robbins
Communication is one of the important topics of