Definition: HD-DVD is one of two major High Definition DVD formats (see Blu-ray) that are vying to replace the current DVD standard in the U.S. market. HD-DVD is supported on the hardware side by Toshiba, NEC, Sanyo, Thomson (Note: Thomson also supports Blu-ray). On the software side, HD-DVD is supported by New Line Cinema, Paramount Pictures, and Universal Pictures. Microsoft has also added its support to HD-DVD.

