Pixel
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A pixel (which is short for "picture element") is the smallest part of a digital image. Like an atom, a pixel cannot be broken down further. The size of the pixel depends on the resolution of the image display, in other words, it is as large or as small as the user chooses to display it. The color of a pixel is some combination of red, green and blue (also known as RGB). Pixels are most often squares in computer displays, but they do not necessarily have to be squares.