The term 'user journey mapping' in UX design refers to the visual representation of the process a user goes through when interacting with a product or service. This technique helps identify each touchpoint a user encounters, including their emotions, motivations, and pain points. By mapping the user journey, designers gain insights into how users experience the product, enabling them to pinpoint areas for improvement that enhance user satisfaction and retention. This process is critical in creating user-centric designs that lead to more effective and engaging user experiences throughout the entire lifecycle.