Bold is a specific weight variation within a typeface family characterised by thicker strokes than the standard or regular version, and it is primarily applied to make specific text stand out.
The precise thickness of a bold variant is not dictated by any universal mathematical formula; the exact visual step up from lighter weights like Regular or Medium, and the step down from heavier options like Extra Bold or Black, is entirely up to the type designer. While the weight axis in variable fonts shifts this granular structural control directly to users, traditional web standards assign bold text a fixed font-weight value of 700 in CSS.
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