HDMI stands for High Definition Multimedia Interface and is the most frequently used HD signal for transferring both high definition audio and video over a single cable. This cable we call it HDMI cable.One HDMI cable can transmit both audio and video signals, which means you only need one cable to complete the entire setup—cutting down on some of that cord clutter that's amassed behind your entertainment cabinet. HDMI stands for "High-Definition Media Interface." But, it's not just a type of cable, cord, or connector. It's a technology standard that's designed to transmit high-definition audio and video signals.