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Connector Types / Images

Male and Female connectors, do you really know the difference?
Picture with labels of USB, PS/2, Parallel and serial connectors

Connectors on your computer Motherboard: PC
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HD15 15 pins in three rows, pins are skinnier than a usual "DB" connector, thus it's got an "H" for High Density. Used for PC's SVGA video cards and monitor cables.	DB15 15 pins in two rows, pins are just like a DB9 or DB25. Used for Mac monitors.
BNC connectors are used on Macs, Sun's and just about anything that's old and good.
DB9 9 pins in two rows, used on older monitors, and VGA's. PS/2 style Serial ports also use DB9 connectors.	13W3 a bunch of "DB" style pins and three funny looking coax contacts. Used on Sun and Mac monitors.

Parallel/Printer
CN36 (female) This is the connector you see on the back of most printers.	CN36 (male) This is the connector used by most printer cables.
DB25 (female) This connector is used for parallel printer output on the PC. It is also used for SCSI output, especially on the Mac.	DB25 (male) This is used for parallel printers (and other parallel port devices) as well as SCSI and serial ports. If you see a male on the back of your computer, it is usually your COM2 serial port.
HPCN36 male This is the new "Type-C" IEEE-1284 Parallel port connector which is used on some new laser printers.	MINIDIN-8 (female) *Serial* Mac connector. Mac Printers, Mac printer and modem outputs, etc.
Serial

DB25 serial connector. On a computer, this would be a male not a female as pictured above.	DB9 serial connectors. On the computer there should be a "male" connector, the mouse or other serial device (modem, digital camera) would have a female.
USB and Firewire connectors

"i.Link" connector. This is basically a 4-pin Firewire/i.link/IEEE-1394 connector.	"Firewire" connector.This is a 6-pin Firewire/IEEE-1394 connector.

USB type "A" connector. Connects to computer or USB Hub.	USB type "B" connector. Connects to peripheral or to USB Hub.

Mini USB connector used on many new USB digital cameras.	Mini USB 2.0 connector used on many new USB digital cameras.
Other connectors
S-Video connector, sometimes called S-VHS or Y/C video. There're 4 little pins in there, it's called a DIN4.	RCA (above) connector. Standard stereo connector. 3.5 mm Mini Phone Plug connector, (below) used on computer sound cards.
SC connector, fiber optic network connector.	ST connector, fiber optic network connector.
MTRJ fiber optic network connector.	Toslink connector. Used for digital audio.

Connector Types / Images

Monitor Connectors

Other PC/Mac connectors