What is x-height?
X-height is the height of a font's lowercase letters, like the letter x, which strongly affects how large and readable the font looks.
X-height is the distance from the baseline, where letters sit, to the top of lowercase letters that have no tall parts, such as x, a and e. Two fonts set at the same size can look very different because one has a taller x-height. Fonts with a generous x-height tend to read better on screens and at small sizes.
Why it matters for your business: When choosing a body font for your website, a larger x-height often means better readability on phones.
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