digital video recorder
Definition:
A device used to digitally record television programs so they can be watched at a later time. Unlike a VCR, a DVR stores its programming on a hard drive, much like a file is stored on your computer. DVRs typically allow you to record 100 or more hours of standard television programming (much less than that for high definition programming) and allow you to perform actions not possible with a VCR such as pausing live television or setting up a scheduled recording to record your favorite shows based on title, actor, director or key word.
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720p
The "720" part of 720p describes the number of vertical lines that make up a television or video signal. Most television or video signals are rated at 480, 720 or 1080. The more vertical lines that make up the picture, the crisper or higher definition the picture. The "p" following 720 indicates that the video display is constructed using a progressive scan method.
720p is considered a middle-of-the-road high definition format and many television stations have begun digitally broadcasting in 720p as an initial high definition offering.