You can walk into nearly any office today, big or small and you will find a fax machine. Connected to a normal phone line, a fax machine 
allows you to copy send and receive documents instantly. The word ‘fax’ is the short form for ‘facsimile’ which means ‘an exact copy’. The fax machine works like a combination of a telephone and photocopier. The user places the paper with a picture or message into the document feeder of the sending machine. He then dials the telephone number of the receiving fax machine.An optical scanner in the sending machine records the variations between light and dark areas of the document. These variations are recorded as dots arranged in a series of rows or columns. A photo-electric cell converts the dots into electronic impulses which are transmitted through telephone wires to the receiving machine.The receiving machine converts the electrical impulses back into a series of dots. The decoded signal is sent to the print mechanism of the receiving fax. A duplicate of the original picture or message appears like magic!
