UI is a tag that can be used to label, categorize, or filter content related to user interface design. UI design is the art of creating and enhancing the visual and interactive aspects of a product or website, such as buttons, menus, icons, colors, fonts, etc. UI design helps users navigate and interact with a product or website easily and effectively. UI design is often paired with UX design, which deals with the overall functionality and usability of a product or website. UI design is a key component of web development, graphic design, and product management.