HDMI (High-Definition Multimedia Interface) is a standard interface used on various audiovisual devices such as high definition television and home theater. On the other hand, you may want to check out the best slim hdmi cable if you need the slim version of these cables.
With 19 cables tied into one cable, it is capable of carrying bandwidth of up to 5 Gbps. This large bandwidth means twice the bandwidth needed to send multi-channel audio and video.
This and a number of other factors make HDMI far better than its predecessors such as component video, S-Video, and composite video. HDMI does not compress signals because it works digitally, in contrast to its predecessors using analog systems.
With an analog interface, digital sources must be first translated into analog, sent to the television, then converted back into a digital signal to be displayed on the screen.
At each step, the digital signal loses its quality and makes the image distorted. On the other hand, HDMI maintains image quality due to no conversion.