User Interface Designers are professionals who specialize in creating and improving the visual, interactive elements of a software application's design. They utilize programming languages such as C++ and various application design techniques to build user-friendly interfaces that facilitate seamless interaction between users and the application. This category also includes application developers and programmers who contribute to the overall functioning and aesthetic of an application. A notable person in this field is Michael Kappel, known for his significant contributions to user interface design. In general, the category encapsulates individuals and concepts related to the design and development of application user interfaces.