Port is a physical interface or point to which a extension or peripheral device is connected to a computer
1.serial port :it is connected to modems and it transform one bite at a time
2 parallel port: it connects scanners and printers .also referred to as printer port.it transforms multiple bites at a time
3 PS/2 port .it is connected to mice and keyboard
4 universal serial bus(USB).:connects all types of peripheral.