Final answer:
Human factors psychology is the term for improving the interaction between a user and a product to enhance usability and accessibility.
Step-by-step explanation:
The term for improving the interaction between a user and a product to enhance usability and accessibility, ultimately enhancing the user experience, is human factors psychology.
Human factors psychologists study how people interact with technology and design machines that fit human requirements. They focus on the integration of the human-machine interface in the workplace, through design, and aim to improve safety, reliability, and the overall user experience.