The document provides an overview of the key areas covered by the discipline of human-computer interaction (HCI). It discusses topics like input/output devices, dialogue techniques, application areas, ergonomics, evaluation methods, design approaches, and implementation tools. It explains that HCI is worth studying because it allows computers to be used more productively by accounting for human limitations, improves the fit between humans and technology, and ensures systems are easy to use for diverse groups of people. Understanding the complex relationship between humans, computers and their interface is important as technology increasingly impacts society.