"Human-computer interaction" (HCI) is the study of the design and use of computer technology, focusing primarily on the interfaces between people and computers. It examines how humans interact with digital systems and aims to improve usability by understanding user needs, behaviors, and preferences. HCI integrates aspects of computer science, cognitive psychology, and design principles to create intuitive and efficient interfaces, enhancing user satisfaction and experience. Overall, HCI is essential for developing more accessible and effective technology solutions.