Yes, HDMI is fully backward compatible with DVI compliant devices. HDMI DTVs will display video received from existing DVI-equipped products, and DVI-equipped TVs will display video from HDMI sources. However, some older PCs with DVI are designed only to support computer monitors, not televisions. Consumers buying a PC with DVI should make sure that it specifically includes support for television formats and not just computer monitors.
HDMI stands for "High Definition Multimedia Interface". It is the latest standard which integrates the same digital video bitstream as DVI-D (Single Link) with up to eight channels of high-res
digital audio. What's more, it is a two-way communicating bus, allowing a source
and display device to "talk" to each other.