In their book, Communication: Principles for a lifetime, Beebe, Beebe and Ivy provided a workable definition for communication. ". . .communication is the process of acting on information." You know something and you share it with someone. They hear what you say and they act on it in some way. Those of us who are effective think about our communications so that the goals we have can be reached most effectively.
With such a broad definition you have to believe that the whole subject of communication must be very broad indeed. It is. Everything that you do and much of what you choose not to do is used by others determine something about who you are and what you stand for. We often try to deny that we can be so easily read, but the fact is that we read others just as well and move in their direction if what we see is congenial. So we say that communication is inescapable. In addition, it is irreversible. Once the idea is planted in another mind, there is nothing short of trauma that can remove it. That's why our mothers told us to always "put your best foot forward."
When you combine several elements of communication together, such as email, phone calls, observed actions, the impact of the communication becomes very complicated. Our communication, intended or not, takes on a life of its own and we are largely powerless to amend it. It is irreversible.
Communication should take up a very large portion of our energy everyday. It is the basic tool with which we build our lives and professions. Done carefully it will greatly aid us in achieving our goals. Done poorly, we will find ourselves saying things like, "I don't know what she sees in him? I'm at least as capable as he is."