What’s the difference between UX and UI?

User experience (UX) design focuses on the overall experience that users have when using a digital product or service whilst user interface (UI) design focuses on the specific assets the user will interact with within the interface. UX and UI do go hand-in-hand; the best result for a digital product or service will depend on these both areas working together. Both terms are related and there is overlap between them but they are not interchangeable.