Serial Port
The serial port is used for the computer to communicate with a device one bit at a time. The data moves serially one bit at a time from one device to anther. The serial port connects to devices such as modems, printers and digital cameras. Serial port is the oldest kind of port.
To communicate using serial communication, two communicating devices must use the same communication parameters such as the communication mode, baud rate (bit per second), parity bits,etc. Serial ports enable data flow in both directions. Most PCs have two serial port connectors : A compact 9-pin connector and a larger 25-pin connector. A 25-pin connector was introduced with the PC system, but as not all 25-pin are used for data transmission, IBM introduced 9 pin connectors with the PC system.
Parallel Ports
Parallel ports transmit data in a parallel manner.Parallel ports are wide in size to enable parallel transmission of data. This port is also known as the 'printer port' because it is commonly used for printer interfacing. Parallel ports are much faster than serial ports. Scanner, tape backup, portable CD-ROM drives, etc. are also designed to use the parallel port.
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