Encyclopedia Britannica" communication is that, by any means, exchanging information. Refers to between one person and another person with visual symbols, telephone, telegraph, radio, television, or other tools for the media, in the message exchange method.
La Swell thinks, what communication is what people say, to what people by what route, achieve what results.
Simon thinks, communication can be regarded as any kind of program, this program, each member in the organization, its decision or premise, transfer to other members.
Communication is the people in some way or manner of certain information from sender to receiver in the interactive process, and obtain the understanding of the process.