High-definition television (or HDTV) refers to video having resolution substantially higher than traditional television systems (standard-definition TV, or SDTV, or SD).
HDTV has one or two million pixels per frame, roughly five times that of SD.
Today HDTV is digitally broadcast using video compression.
Some personal video recorders (PVRs) with hard disk storage but without high-definition tuners are described as “HD”, for “Hard Disk”, which can be a cause of confusion
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