Pixel aspect ratio (often abbreviated PAR) is a mathematical ratio that describes how the width of a pixel in a digital image compares to the height of that pixel. Most digital imaging systems display an image as a grid of tiny, square pixels. However, some imaging systems, especially those that must be compatible with standard-definition televisi...
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http://en.wikipedia.org/wiki/Pixel_aspect_ratio
The ratio of width to height of a single pixel. Often means sample pitch aspect ratio (when referring to sampled digital video). Pixel aspect ratio for a given raster can be calculated as y/x multiplied by w/h (where x and y are the raster horizontal pixel count and vertical pixel count, and w and h are the display aspect ratio width and height). P...
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http://www.videohelp.com/glossary?P
pixels are usually square, (an aspect ratio of 1) but not always. When they are not square in shape, they will have a pixel aspect ratio greater or less than 1
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https://www.encyclo.co.uk/local/20511
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