User interface design is a research area that focuses on creating seamless and intuitive interactions between users and computer systems. It involves designing the visual layout, functionality, and navigation of software applications, websites, and other digital interfaces to enhance user experience. User interface design aims to make interactions with technology easy, efficient, and enjoyable for users by considering their needs, preferences, and behaviors. This research area often incorporates principles from psychology, human-computer interaction, and graphic design to inform the design process.