Human-Computer Interaction (HCI) is an interdisciplinary field focused on the design, development, and evaluation of user interfaces and interactions between humans and computers. HCI aims to improve the usability and user experience (UX) of software, hardware, and systems by understanding human behavior, cognitive processes, and ergonomics.

Researchers and designers in HCI study how users interact with technology, considering factors like ease of use, learnability, efficiency, and satisfaction. HCI also focuses on creating intuitive, accessible, and inclusive interfaces for diverse users, including those with disabilities. The field encompasses user interface (UI) design, interaction design, usability testing, and accessibility, among other topics.

HCI plays a crucial role in modern product design, from mobile apps to virtual reality systems, as it ensures that technology is user-friendly and meets the needs of its intended audience.