Serif

	Sans-serif font
	Serif font
	Serif font (red serifs)

In typography, a serif (/ˈsɛrɪf/) is a small line or stroke regularly attached to the end of a larger stroke in a letter or symbol within a particular font or family of fonts. A typeface or "font family" making use of serifs is called a serif typeface (or serifed typeface), and a typeface that does not include them is sans-serif. Some typography sources refer to sans-serif typefaces as "grotesque" (in German, grotesk) or "Gothic"^[1] (although this often refers to blackletter type as well). In German usage, the term Antiqua is used more broadly for serif types.

Serif typefaces can be broadly classified into one of four subgroups: Old-style, Transitional, Didone, and Slab serif, in order of first emergence.