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The Display Data Channel, or DDC, is a collection of protocols for digital communication between a computer display and a graphics adapter that enable the display to communicate its supported display modes to the adapter and that enable the computer host to adjust monitor parameters, such as brightness and contrast.
Like modern analog VGA connectors, the DVI and DP connectors include pins for the display data channel (DDC), but DP supports DDC within its optional Dual-Mode DP (DP++) feature in DVI/HDMI mode only.
The standard was created by the Video Electronics Standards Association (VESA).

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