"So how do we measure height and width? When you hear people talking about photo “resolution” they often use terms like DPI (Dots Per Inch) and PPI (Pixel Per Inch). DPI is a physical measurement for photographs, because dots have an actual size. You can see the size of the dots if you look carefully at photo printed out, or an image generated on a computer screen. PPI is a virtual measurement used for digital images. This is because pixels are points in space we define mathematically, adding informational characteristics to such as color and contrast. They have no actual size or physical characteristics until converted to something real, such as a dot of ink or colored light on a computer screen."
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