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HDMI is for Video and Sound. With 19 wires wrapped in a single cable, HDMI is able to carry a bandwidth of 5 Gbps (gigabits per second). This is more than twice the bandwidth needed to transmit multi-channel audio and video. HDMI handles both Video and Sound. With 19 wires wrapped in a single cable, HDMI is able to carry a bandwidth of 5 Gbps (gigabits per second). This is more than twice the bandwidth needed to transmit multi-channel audio and video.