Video and audio ports are electrical or optical connectors used to transmit audio or video signals. Audio and video interfaces define physical parameters and signal interpretation. Video and Audio Ports define the physical layer, data link layer, and most or all of the application layers for digital audio and digital video. These functions are all shown in a single signal specification for analog audio and analog video, such as NTSC or the direct speaker-driving signal of analog audio. These ports, which can send audio and video to an external display, are commonly found on graphics cards and high-end motherboards.
