This document discusses four main font types - serif, sans serif, script, and decorative - and how they visually differ from each other. Serif fonts have tails on the ends of letters and are more formal, while sans serif fonts lack tails and appear modern. Script fonts mimic handwriting and can look sophisticated, but decorative fonts can be over the top if not used carefully for the right text. The visual differences in fonts can affect how mature, formal, modern, or interesting the reader perceives the text.