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DB-15 (Mac Video)

Used on beige Macintosh computers until 1999. It was replaced by VGA.

S-Video

Main use is connecting to TV's. Higher quality than "composite".

Warning: This is not ADB (Apple Desktop Bus), a type of keyboard/mouse connection used on old beige Macintosh computers.

VGA (Video Graphics Array)

A standard for connecting monitors and projectors to computers.

Note: Unknown to many people, most slot-loading iMac G3's have a VGA port hidden within a panel on the rear of the machine.

mini-VGA

Basically the same as VGA (see left), but miniaturized.

This connection is common on iBooks, eMacs, and iMac G4/G5's.

Common adapters are "mini-VGA to VGA" and "mini-VGA to S-Video/Composite". Apple has published a compatibility chart.

DVI (Digital Visual Interface)

DVI comes in five varieties. See WikiPedia for a technical breakdown.

mini-DVI

Basically the same as DVI (see left), but miniaturized.

This connection is found on MacBooks and iMacs.

Common adapters are "mini-DVI to DVI", "mini-DVI to VGA", and "mini-DVI to S-Video/Composite".

ADC (Apple Display Connector)

Similar to DVI (see above), but it also included USB-style data flow. Although a good design, it lacked popularity.

micro-DVI

This picture might not be accurate.

Basically the same as mini-DVI (see above), but ultra-minaturized.

This connection is found on the MacBook Air.

Common adapters are "micro-DVI to DVI", "micro-DVI to VGA", and "micro-DVI to S-Video/Composite".

Composite

A series of 1-3 RCA-style connections (red, yellow, white). One cable is for video and two are for audio. Composite video is lower quality than most other options, but it is popular.

Component

A series of 3 RCA-style connections (red, green, blue). Although these connections look a lot like composite (see above), they carry a different signal.

Other