Communication: A simple model
In order for communication to take place you need at least two important participants.
A sender
A receiver
The sender has a message, or something to say, or relay. (What do you suppose this man has to say?)
Using a "Channel" or means of getting his message across, he relays the message to a receiver.
"Yo, mama! You wanna buy a watermelon?"
He can advertise his watermelon many ways:
Through telephone solicitations... Take out a radio ad...
Or publish it on the world wide web!
Obviously, there are many other ways he can share his message. TV, newspaper, and word- of- mouth, all are possible channels.
The receiver of his message...
"Encodes", or interprets the message. She then "decodes" or answers, and gives what is called "feedback." Feedback lets a sender know if his message has been received and understood. The receiver can use feedback to gather more information from the sender.
Sometimes "noise" interferes with the receiver understanding or hearing the message...
Now this is what I call definite noise!
"What? I can't hear you! There is an alien spaceship landing!"
So, let's review a simple communication equation:
Sender + message + channel +
receiver + encoding/decoding + /- Noise =Feedback.

This equation repeats itself in a constant cycle. Sometimes, we don't even know we are sending messages to others, but we may be doing so nonverbally, as well.
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