A message is a set of signs. It implies an encoding by the transmitter, and decoded by the receiver (hence the need for a common code). The information theory was developed to mathematically determine the rate of information transmitted in the communication of a message through a channel of communication, especially in the presence of parasites called noise.
Message are made by people that work during hours, days, or years to deliver an idea, in general a peace idea, to a god or the whole world with this nowday technology that's represent Google Earth / Google Maps.
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