This lecture introduces the field of Human-Computer Interaction (HCI) and Human-Robot Interaction (HRI). It covers the challenges faced by users with current interfaces, emphasizing the importance of usability, user experience, and adoption. The lecture discusses the principles of HCI, the impact of design on user perception, and the different interaction styles. It also touches on topics like data visualization, accessibility, and the use of virtual and augmented reality in enhancing user experience.