The document provides an overview of human-computer interaction (HCI), including definitions, recent advances, trends and challenges. HCI is the study of how humans interact with computers and how to design interfaces for successful human-computer interaction. It is an interdisciplinary field that incorporates areas like computer science, psychology, anthropology, sociology and ergonomics. The document discusses applications of HCI in education, healthcare and everyday life. Advances in technology have led to new interaction methods like wearables, virtual reality and ubiquitous computing.