Mobile User Experience (UX) refers to how users interact with applications and websites on their mobile devices. It focuses on creating a seamless and enjoyable experience by considering factors like screen size, touch controls, and loading speed. Good mobile UX ensures that users can easily navigate, find information, and complete tasks without frustration. Key elements of mobile UX include responsive design, which adapts layouts to different screen sizes, and intuitive navigation that allows users to move through the app or site effortlessly. Additionally, optimizing performance and minimizing loading times are crucial for keeping users engaged and satisfied with their mobile experience.