HDMI (High Definition Multimedia Interface) is a appressed 19-pin plug (little bigger than a USB connector). The hdmi cable is for connecting High-Definition video and audio-capable components (HDTVs, HD-DVD and Blu-ray players, HD camcorders)
The ideal theory behind HDMI is the use of a single AV interconnect instead of several cables when connecting an audio/video source such as a set-top-box or DVD player to an AV receiver and or a flat-panel TV, over a single HDMI cable.
