Font styles refer to the different designs and appearances of text characters used in written communication. Common font styles include serif, which have small lines or decorations at the ends of letters, and sans-serif, which are clean and modern without these embellishments. Other styles include script, resembling handwriting, and monospace, where each character occupies the same amount of horizontal space. Choosing the right font style is important for readability and conveying the intended tone of a message. For example, a formal document may use a serif font for a professional look, while a creative project might benefit from a playful script font.