A serial port is also called a communication port and they are used for connection of external devices like a modem, mouse, or keyboard (basically in older PCs).
Parallel ports are generally used for connecting scanners and printers.
An Infrared(IR) port is used to send and receive infrared signals from other devices.
USB (Universal Serial Bus): This can connect all kinds of external USB devices, like external hard disk, printer, scanner, mouse, keyboard, etc.
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