Serif is a small decorative stroke added to the end of a letter's main stroke in typefaces, used to guide the eye and convey a sense of tradition or authority. In typography circles, a serif font is contrasted with sans-serif, and distinguishing features are the serifs’ shapes and proportions. The term also appears in UI design as a typographic style choice. The concept dates to ancient typographic practices and has evolved with metal type and digital fonts.
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