Interaction design is a field that focuses on creating products, services, and systems that are user-friendly, intuitive, and engaging. It involves designing the way that users interact with digital interfaces, such as websites, mobile apps, and software programs, in order to improve the overall user experience. Interaction designers often use principles from psychology, human-computer interaction, and user experience design to create designs that are both functional and enjoyable for users to use. This research area also encompasses topics such as user testing, usability testing, and user interface design.