Computer ports or Motherboard I/O interfaces are used to connect external devices to the computer. These interfaces are mostly located on the back side of the motherboard. Number of Interfaces depends on the size of Motherboard and technology used.
PS2 Din Connector
PS2 6 pin din connector
Green for mouse
Purple for keyboard
Older USB 1.0 1.5 Mbps.
USB 2.0 480 Mbps.
New USB 3.0 5 Gbps.
Serial port used to connect the modem, Monitor, mouse, printer etc. It is 09 pin connector. RS 232 standard. Older interface.
Send several bits at a time. Used for printers. Older interface.
NIC Network Interface Card
RJ 45 connector is used to connect the Internet.
eSATA external SATA
It is just like USB or Firewire port. It is used to connect an external SATA drive.
VGA Port (Video Graphics Adapter)
Use to connect the monitor. It is 15 pin connector normally in blue color.
DVI Digital Visual Interface
New technology than VGA port. It produces high-quality pictures.