Font categories are classifications that help designers and typographers choose the right typeface for their projects. The main categories include serif, sans-serif, script, and display. Serif fonts have small lines or decorations at the ends of their letters, making them often used in print for readability. Sans-serif fonts lack these embellishments, giving them a clean and modern look, ideal for digital content. Script fonts mimic handwriting and are often used for invitations or decorative purposes, while display fonts are designed to attract attention and are typically used for headlines. Understanding these categories helps in selecting the appropriate font for various contexts and audiences.