The term for the practice of designing user-friendly interfaces for software and websites is called user experience (UX) design. UX design focuses on creating products that provide meaningful and relevant experiences to users by enhancing usability, accessibility, and enjoyment. This practice involves understanding users' needs through research, prototyping, and testing, ensuring that interfaces are intuitive and efficient. A well-executed UX design can significantly improve user satisfaction, increase engagement, and ultimately drive the success of a digital product.