Fax
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It is short form for facsimile. Documents are electronically scanned and are converted into a bit map image. They are sent as electrical signals through telephone networks and when received by the other machine, it is printed out by the other machine.
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It is the method of sending text and attachments from one computer to another. Some advantages include free of of cost and high speed delivery. However there is the possibility of virus threats and hacking and the inability to send big objects.