HDMI cables are cables used to transmit high-definition video and audio from one device to another. HDMI stands for “High Definition Multimedia Interface” and is a single cable solution for connecting devices such as Blu-ray players, game consoles, video projectors, and other audio/video sources to HDTVs and displays. HDMI cables are capable of carrying much higher resolutions than the older analog cables, so they are important when trying to get the highest quality picture and sound out of your home theater system. They are also extremely versatile and come in a variety of lengths, so they can be used for a variety of different set-ups.