Developed in 1995, DVD has become the standard medium for Doctor Who releases since the late 20th Century. Unlike VHS, DVDs contain digital, rather than analog, video data, and superior audio quality.
Doctor Who DVDs have been released by 2|entertain and BBC DVD since 1999. With restoration by the Doctor Who Restoration Team and an abundance of special features, they are generally released in the United Kingdom first, with United States, Australian and other releases following.
DVDs are generally encoded for a specific region only and are not compatible with DVD players from other regions. However, there are exceptions. For example, most United Kingdom releases are encoded Region 2+4, except some released since 2009.