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Various devices used to make use of serial ports (Printers, modems, serial mice, joysticks, gps receivers, and much more). The parallel port was designed as a standard for printers, but eventually made use of peripherals such as (zip drives, scanners, hard disk, cd-rom drives and modems)... Now a days you don't see serial or parallel being used too often anymore, since most have made the shift to USB.

Here is some more in-depth information on wiki for the two standards.

http://en.wikipedia.org/wiki/Parallel_port

http://en.wikipedia.org/wiki/Serial_port

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