While 720 is the technical low end of HD, 1920x1080 is generally what most people mean when referring to High Definition
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Yeah 1920x1080 is referred to as “Full HD”.
Yep 720p is just HD.
I guess they're going off the exact ratio of 1280x720 or something.
That's just HD ready
Pretty sure HD ready is 540p that can take a 720p signal.
720p is HD and 1080p is Full HD. 4K is Ultra HD.