USB is the latest method of using a keyboard and mouse however, before the use of a USB hub, the use of green and purple PS/2 slots were available; purple for the keyboard, and green for the mouse. To find which connectors came before the PS/2 connectors, please refer to ancient Hieroglyphs for better answers.
I've used USB, PS/2 and Serial keyboards.
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A keyboard can use a DIN, PS/2, USB, or wireless connection. For most installations, all that is necessary is to plug in the keyboard and turn on the system.
It's almost always a serial port of some kind, but might be an old RS-232 type serial port, a PS/2 serial port, or a Universal Serial Bus port depending on the mouse in question. It could even be Bluetooth (which is still a serial protocol).
It is simply a USB port
Answer
An older type of connection is a PS/2 port, and with the introduction of USB it is rare to find one of these.
Most modern PC keyboards connect to a computer by USB connection. Some of the older ones may use a PS/2 port or a serial port for a DIN or AT connector.
The older PS/2 connector, or the more commonly used USB connector.
1] Parallel ports) 2] S/PDIFl Port (for coaxial cable) 3] Keyboard Port/Mouse Port
if your refering to ports either ps/2 or USB
RS-232RS-422ParallelGPIBUSBetc.
USB and serial cables
There is only two types of I O ports. The two ports is a USB and serial.
network, FireWire, and serial.
USB and FireWire
there are many ports that come directly off a mother board1) keyboard port2)mouse port3) a parallel port4) two S/PDIF port5)a fire wire port6) six sound ports7)a network port8) four USB ports9) and a wireless LAN antenna port
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Keyboard
what three types of slave labor might be found on a well established plantation
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