User Experience (UX) and User Interface (UI) are closely related but distinct concepts. UX focuses on the overall experience a user has while interacting with a product, including aspects like usability, accessibility, and emotional response. On the other hand, UI specifically deals with the visual and interactive elements of a product, such as buttons, menus, and layout, aimed at facilitating user interaction. In essence, UI is a subset of UX, as it contributes to the overall user experience by providing an interface for interaction.