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From: http://techtips.salon.com/digital-tv-vs-hdtv-10424.html
"Digital TV is the process of broadcasting, receiving and processing television signals digitally, as opposed to the older analog broadcasting.... HDTV is a term used to describe video that is sharper and more detailed than standard definition, due to a much higher number of lines of resolution, identified as 720 or 1080p."
More info:
HDTV FAQs: What is the Difference Between Digital TV and HDTV?
http://hometheater.about.com/cs/beforeyoubuy/a/aahdtvfaqs2a.htm