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

Standard S-Video connection.
Composite

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).

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

YPbPr component video out on a consumer electronics device.

Three cables, each with RCA plugs at both ends, are often used to carry YPbPr analog component video
Coaxial

The one used very often for cable company. Easy to found on the wall.
The four above are analog video connection.
For video quality, from best to worst are:
Component > S-Video > Composite > Coaxial
So now we know how to choose the best one.

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