SinceNine19 is partially correct, if he is referring to 1080p. However, there is debate among videophiles as to whether 720p or 1080i is the better format.Originally Posted by SinceNine19
While framerates can change, 720p is always progressive format with a resolution of 1280x720 pixels, and typically 60 fps. 1080i is interlaced format with resolution of 1920x540 and typically 60fps (usually meaning 1920x1080 total pixels effectivly 30fps).
1280x720 = 921600 pixels per frame
1920x1080/2 = 1036800 pixels per frame
so the two formats produce similar pixel counts, but 720p better reproduces fast motion. For comparison, computer monitors are inherently progressive. For things like games, you usually want progressive video. 1080p is 1920x1080 with 60 fps.