Communication is what our mind makes of the information that comes through our senses.
Communication is not about the technical or logistical requirements of delivering information to one place or another. Communication always occurs in the same place ... in the mind of the person(s) receiving information.
If you are hurrying to catch a plane and someone stops you and starts talking, you have been interrupted - technically. Interruption changes to enlightenment when the person says, "Sorry to bother but you dropped your cell phone back there." The technical requirements of delivery and physical place in which the message is delivered have not changed, but the communication sure has.
The method our minds use to make sense of information is evocation. The decision as to what information to use in a communication is wholly dependent upon the experiences of the mind(s) that will receive the information.
Often there are multiple ways to deliver information which result in the same communication.
"Sorry to bother but you dropped your cell phone back there," might just as well be delivered by a pointing gesture or a handing over of the dropped cell phone. In each case the communication is the same even though the method of delivery is different, (words, gestures, physical representation).
The task of a communicator is to create information that is evocative of the desired result in the mind(s) of the receiver.