In typography, serifs are semi-structural details on the ends of some of the strokes that make up letters and symbols.
A font that has serifs is called a serif font (or serif typeface). A font without serifs is called sans-serif, from the French sans, meaning “without”. Some typography sources refer to sans-serif typefaces as "grotesque" (in German "grotesk") or "Gothic," and serif types as "Roman." Read more about serif fonts on Wikipedia.
