A typeface is a set of characters that share a common design, including letters, numbers, and symbols. Each typeface has its own unique style, which can convey different emotions or messages. Common examples of typefaces include Arial, Times New Roman, and Helvetica. Typefaces are often categorized into families, such as serif, sans-serif, and script. Serif typefaces have small lines or decorations at the ends of their letters, while sans-serif typefaces do not. Choosing the right typeface is important in design, as it affects readability and the overall aesthetic of a project.