Why we should use HDMI Cable?

Simply, because it's the best and most convenient audio/video connection you can buy. For practical purposes, HDMI is also the only way you can experience 1080p "full HD" video in your home.* This means that if you want to enjoy the full video potential of sources like Blu-ray players, HD set-top boxes and upconverting DVD players, you must connect each of them with an HDMI Cable.
There are a host of reasons why HDMI is superior to other connections:
All-digital signal transfer
Unlike older kinds of video interconnect cables such as component video, S-video and composite video, HDMI carries an uncompressed, all-digital representation of the data transmitted between components. Since the vast majority of this information originates in digital form and is displayed digitally on today's HDTVs, the HDMI interface eliminates the need for complex digital-to-analog and analog-to-digital processing stages before and after the cable connection, so the information remains in its purest form throughout the signal chain. The end result is an essentially perfect transference of all picture information for consistently dazzling image quality.
One-cable convenience
HDMI offers the same all-digital signal transfer for audio signals — up to eight simultaneous channels of high-resolution audio, that is — and it does so within the same single cable/connector configuration. Before HDMI, you'd need as many as three individual video cables, plus at least one individual audio cable, just to hook up a single audio/video component to your TV. With HDMI, all that information travels flawlessly through a single, reliable Best HDMI Cable. In today's typical home theater, with its multiple source devices (cable and satellite boxes, Blu-ray and DVD players, gaming consoles, etc.), this translates to a much cleaner, less confusing system of wires behind the scenes.
Near-universal implementation
The surging popularity of HDTV and other high-definition technologies has made the HDMI connection a de facto standard on wide array of consumer electronics products. Today, virtually every HDTV, projector, receiver, DVR, Blu-ray player and cable or satellite box sold comes standard with at least one HDMI connection. You'll also find HDMI on multimedia PCs, laptops, gaming consoles, camcorders and digital still cameras, to name a few.