HDMI cables are used to transfer uncompressed digital audio & video signals in entertainment equipment like televisions, computers, DVD players, & monitors. The HDMI abbreviation stands for High-Definition Multi-media interface. HDMI cables come in one of two types. These include the Type A HDMI cables with 19-pin connectors & the Type B HDMI cables with 29 pins, offering a higher resolution signal to component parts. The latter version is a more standard technology offered today.