A font is a specific size, weight, and style of a typeface. Helvetica is a typeface. Helvetica Bold 12 point is a font. The distinction comes from the days of metal type, when a font was the physical set of letters in one size and style. Digital technology has blurred the line. Most people now use font and typeface interchangeably, and software menus do the same. In practice, the difference rarely matters outside of professional typography.

Fonts come in families with many variations. A single family might include light, regular, medium, bold, and black weights, plus italic and condensed versions. Designers choose weights to create hierarchy. A bold headline next to regular body text signals importance. A light weight for a large display heading feels elegant and airy. The choice of font affects readability, tone, and how much space the text occupies on a page. A condensed font fits more words in a narrow column. A wide font takes more room and feels more relaxed.

Common font styles

• Serif: with decorative strokes at the ends.
• Sans-serif: without decorative strokes.
• Script: resembling handwriting.
• Display: designed for headlines and short text.

Font selection is not just aesthetic. A poorly chosen font can slow reading, confuse users, or undermine a brand's credibility. It is one of the most consequential decisions in a design project.