This document summarizes the main classifications and characteristics of font families, including: Old Style, Transitional, Modern, Slab Serif, Decorative/Display, Sans Serif, and Script/Cursive. Old Style fonts mimic handwriting and have small variations in stroke thickness. Transitional fonts have more contrast and wider serifs. Modern fonts have extreme contrast and thin hairline serifs. Slab Serif fonts are used for commercial printing and have thick uniform serifs. Decorative fonts are used for titles and headings and have ornamentation for visual impact. Sans Serif fonts lack serifs and strokes of uniform thickness. Script and Cursive fonts resemble handwriting with joined or unjoined letters.