Font
In typography, the terms were set when all printing was done with metal type. Font or fount was all the letters or characters of a single size of a typeface. For example, all characters for 9-point Times New Roman is a font, and the 10 point size would be another font.
With the increase in the use of personal computers, the definition of font has changed. The term font is now often used as another name for a typeface. The size of the characters has no effect on fonts when using this definition.
Font Media
The Bauer Bodoni typeface, with samples of the three of the fonts in the family: Roman (or regular), bold, and italic.
Metal type sorts arranged on a composing stick
A 1910 letterpress poster, advertising an auction, using a variety of typefaces and fonts
Weights of the typeface Neue Helvetica
Cyrillic italics and allowed variations
A set of optical sizes developed at URW of the typeface Leipziger Antiqua. The fonts become thicker and more widely spaced as the point size for which they are designed decreases.