720p is a popular high definition resolution video format.  The name refers to 720 rows of pixels that make up each frame.  A full high resolution video would be 1080 pixels across x 1080 pixels down.

The “P” stands for progressive, which means that each frame is a complete image, as opposed to an interlaced video which uses every other row of an image (and alternated between the next frame) and is referred to as 720i.

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