App design refers to the process of creating the visual and interactive elements of a mobile or web application. This includes the layout, colors, typography, and overall user interface (UI) design, as well as the user experience (UX) design, which focuses on how the app functions and how it guides users to achieve their goals. A well-designed app is easy to use, visually appealing, and provides a seamless user experience. The goal of app design is to ensure users can access what they need quickly and easily with minimal effort. A well-designed app should provide a satisfying experience for users while also accomplishing the overall mission of its developer. Key aspects of designing an app include research and development, prototyping, coding, testing and debugging, deploying the product in the app store/marketplace, and continual iteration for improvement.