"HCI" stands for Human-Computer Interaction, a field focused on the design and use of computer technology in a way that enhances the user experience. It encompasses a broad range of disciplines, including interface design, cognitive psychology, and usability engineering. HCI aims to make systems more user-friendly, ensuring that technology meets the needs and expectations of its users. This involves studying how people interact with computers and creating interfaces that improve usability, accessibility, and overall user satisfaction.