DP Alt Mode, or DisplayPort Alternate Mode, is a feature that allows USB-C ports to transmit DisplayPort (DP) signals. This capability enables USB-C ports to carry video and audio signals, effectively allowing devices with USB-C ports to connect directly to displays or monitors that support DisplayPort. 

The USB Type-C video output function is based on adding a DisplayPort video bus to the original USB bus in the Type-C interface. In other words, the video output function of the Type-C interface is USB+DP instead of the traditional USB Display Link technology.

The DP Alt Mode standard specification is published by VESA (Video Electronics Standards Association).

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