Final answer:
Human-Computer Interaction (HCI) is the field focused on understanding user interactions with technology and improving them.
Step-by-step explanation:
The field that seeks to understand every user and how they interact with technology to make these interactions better is Human-Computer Interaction (HCI). This interdisciplinary field involves computer science, cognitive psychology, design, and several other disciplines to enhance the design, usability, and experience of users with computer systems. HCI professionals work to create technology that is usable and accessible to as broad a group of users as possible, taking into account factors like ergonomics, user satisfaction, and the overall user experience.