Communication dates back to prehistory, where it has evolved from cave paintings and smoke signals to having an alphabet or communicating over VoIP Internet Telephony, going through pigeon post, mail, telephone, fibre optics, etc.
Communication can range from very subtle processes of information exchange , to full conversations and mass communication.Human communication was revolutionized with speach aproximately 100.000 years ago, while symbols where developed about 30.000 years ago, and writing 5000 years ago.
The oldest known symbols are the cave paintings, created with the purpose of communication through time.
The next step in the history of communication are the petroglyphs, which where basically rock carvings in the surface. The first ones are dated arround 10.000BC.
Then came Pictograms, which where symbols that represented concepts, objects, activities, places or events. These then evolved into Ideograms, which where graphical symbols representing an idea. Pictograms could only represent something resembling their from; for example a circle could represent the Sun, but ideograms, on the other hand could represent more abstract concept. For example, the circle in the pictogram which represented the sun, could represent as an ideogram 'heat', 'light' or 'day'.
Finally came the writing, which oldest dates arround the Bronze age of the late 4000 BC, which were primarily logographic in nature, based on pictographic and ideographic elements.
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