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A facsimile, more commonly referred to as a fax, is the transmission of a document or image from one place to another electronically. The document to be sent is scanned and sent over a telephone or Internet connection. A combined scanner and transmitter is usually known as a fax machine. Modern-day Internet connections have greatly reduced the use of fax machines.
A facsimile is also known as a telefax or telecopy.
A fax transmits data electronically over a network connection. Originally this network connection was an analog telephone line, but now the Internet is also being used for this purpose. A document to be sent is treated as an image, scanned and converted into bits and transmitted over the line by the facsimile machine. The facsimile machine on the receiving end takes the whole message in terms of bits and then converts it into image. This image is either displayed onscreen or printed for the user on receiving end to read. Facsimile technology is still in use, but has largely been replaced by email.