字体或字模（英语：font；英式英语：fount）是指印刷行业中某一整套具有同样样式和尺码的字形，例如一整套用于内文的宋体5号字、一整套用于标题的10号字就叫一套字体。电脑早期用点阵字，仍然有字体概念，同样一套风格如中易宋体，一套字体是指一整套15×16点数或一整套24×24点数的字。矢量字体出现后，同一套风格字体已不用制作不同点数字型，只需制作一套即可随意缩放，「字体」与「字体」之间的界限开始模楜。一般的英语用户同样分不清「字体」（Font）与「字体」（Typeface）的分别。

In metal typesetting, a font is a particular size, weight and style of a typeface. Each font was a matched set of type, one piece (called a "sort") for each glyph, and a typeface consisting of a range of fonts that shared an overall design.

In modern usage, with the advent of digital typography, "font" is frequently synonymous with "typeface", although the two terms do not necessarily mean the same thing. In particular, the use of "vector" or "outline" fonts means that different sizes of a typeface can be dynamically generated from one design. Each style may still be in a separate "font file"—for instance, the typeface "Bulmer" may include the fonts "Bulmer roman", "Bulmer italic", "Bulmer bold" and "Bulmer extended"—but the term "font" might be applied either to one of these alone or to the whole typeface.