UX is the path, not the paint
People confuse UX (user experience) with visual design. They're related, but they're not the same. Visual design is the paint; UX is the road underneath. A site can be beautiful and still be miserable to use — and a plain site with great UX will out-convert a gorgeous one every time.
UX is the sum of every small moment a visitor has on your site: how fast they find what they need, whether the next step is obvious, how many questions get answered before they have to ask. When those moments are smooth, the visitor never notices the design at all — they just get what they came for. That invisibility is the goal.