A font is a specific variant within a typeface family, distinguished by attributes like size, weight, slant, and italicization. Helvetica is a well-known typeface, while 12pt Helvetica Bold and 14pt Helvetica Light are its fonts.

It's common for people to use the terms "font" and "typeface" interchangeably outside of professional design circles. However, in the realm of typography, they serve distinct roles. A typeface is the overarching design of letterforms, whereas a font is a particular implementation of that design.