A common font is a typographic font that is widely used and recognized in various industries and applications. These fonts are popular because they are easy to read and have a universal appeal that makes them suitable for a wide range of purposes such as print, web, and graphic design. Examples of common fonts include Times New Roman, Arial, Helvetica, and Calibri. These fonts are often pre-installed on most computers and devices, making them easily accessible to users. Overall, common fonts play a significant role in visual communication and are an essential part of typography.