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Component vs Composite vs S-Video vs Coaxial

When we are shopping for a TV or DVD player, etc, we are always confusing by the different connection. Let me keep these comparison for reference.
S-Video (Separated-Video) is better than a composite video connection.
S-Video

300px-Close-up_of_S-video_female_connector

A standard 4-pin S-Video cable connector, with each signal pin paired with its own ground pin.

320px-S-video-connection

Standard S-Video connection.
Composite

composite-video-input

The old “AV” standard connector. The common RCA connector is color-coded Yellow for Composite video.
The term “yellow-plug video” is recommended to help cut down on confusion between “composite” and “component” (which sound alike).
300px-Composite-video-cable

On consumer products a yellow RCA connector is typically used for composite video.
Component (not composite) Video [aka Analog Component Video; Y – Pb – Pr; red-green-blue]:
Uses a three jack cluster of wires with the ends color coded green, blue, and red. (does not include audio cable).
Y-Pb-Pr, or what we nowadays refer to as component video or color difference video, was invented to simplify video electronics and reduce the overall bandwidth requirements for transmitting video compared with RGB. In practice it provides one luminance signal with full horizontal resolution and two color signals with reduced horizontal resolution.
Y = Luminance, Pb = Chrominance 1, Pr = Chrominance 2

220px-Component_video_jack
YPbPr component video out on a consumer electronics device.

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