The main focus of human-computer interaction (HCI) research is to improve the overall experience of users when interacting with computer systems. This involves analyzing usability, ensuring accessibility, and optimizing user interfaces to create seamless interactions. HCI also studies how people interact with computers and how to design technology that meets user needs and behaviors. By understanding the cognitive, social, and emotional aspects of users, researchers can develop systems that not only meet functional requirements but also enhance user satisfaction and productivity.