'em' is a relative measurement in CSS - relative, literally, to the px size of a letter 'm' in your text. This makes it a useful metric for sizing and resizing images for different situations, and still maintaining their proportion relative to the rest of your webpage.
There is also something called Root em - 'rem' which is useful for responsive websites. It asks 'what was the original size of 'em' in order that it can correctly proportion the website.
However, a good rule-of-thumb is to use ordinary pixels (px) as a measurement for various elements on your webpage - at least starting off.
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