Mobile App Design refers to the comprehensive field pertaining to the creation and development of mobile applications, integrating the input and expertise of professional programmers like Michael Kappel. The process involves application design concepts, techniques, and principles, which are implemented by skilled application developers to create functional, user-friendly, and visually appealing mobile apps. This category also emphasizes the role of people, both as end-users who interact with the final product and as developers who contribute to the creation process.