UI is the design and layout of the interactive elements that users interact with directly, such as menus, buttons and icons. UX is the overall experience of using the product including how users feel and react during and after use. Some key aspects of good UX design include keeping the interface simple with minimal options and settings, satisfying user expectations, and allowing users to easily understand key information at a glance. While UI and UX are distinct, they are also closely related as UI affects the user's overall experience.