UX vs UI: what's the difference?
UX is how it works and feels to use; UI is how it looks and what you touch. You need both, and they're not the same job.
UX (user experience) and UI (user interface) get used interchangeably, but they’re different things, and a product needs both to be done well.
UX: how it works
User experience is the whole journey: can someone find what they need, understand it, and get it done without friction or confusion? It covers structure, flow, logic and clarity. Strong UX stays quiet until it goes missing and a simple task starts to feel hard.
UI: how it looks
User interface is the visible, tangible layer: buttons, colours, type, spacing and states. It is everything you look at and touch. Strong UI feels clear, consistent and on brand, and it makes the right action obvious.
A simple way to hold it
UX is the plan of the house; UI is the décor and the door handles.
A beautiful interface over a confusing experience frustrates people. A logical experience with a careless interface feels cheap and untrustworthy. The two need to be designed together, alongside accessibility, responsive design and typography.