The main purpose of a user experience (UX) designer is to enhance the satisfaction and usability of a product by optimizing the interaction between users and the system. UX designers conduct user research to understand needs and preferences, creating user personas and journey maps to guide design decisions. They focus on creating intuitive interfaces that facilitate seamless navigation and task completion. By employing design thinking principles, UX designers ensure that the end product is not only visually appealing but also aligns with user expectations, ultimately leading to higher user adoption and satisfaction.