ABSTRACT
The human should convey what he learned from the information and experience of others and kept for his children and for future generations, so they were invented what is known as the external memory, and is the media that rights record by information external memory, and media such media evolved over time, the man was an old logging information on the walls of caves and then panels of clay, and papyrus in the Pharaonic era and others. So, he developed media like paper, spread paper use significantly inventing the printer, and at the end of the last century digital sources emerged were widespread deployment dramatically in recent years with the widespread use of network Internet [1].
