User experience (UX) is the overall quality of a person's interaction with a website — how fast, clear, accessible, and satisfying it feels to find what they came for. In SEO, strong UX supports rankings indirectly by keeping visitors engaged and encouraging the behaviours search engines reward.
Google folded several experience measures into ranking through its page-experience signals, most visibly the Core Web Vitals: loading speed (LCP), interaction responsiveness (INP), and visual stability (CLS). Mobile-friendliness, secure HTTPS, and the absence of intrusive pop-ups sit alongside them. None of these outweighs genuinely helpful content, but between two comparable pages the smoother one tends to win — and to hold its position, because visitors don't flee back to the results.
An online store's category page took 5.4 seconds to render its product grid on 4G. After compressing hero images and deferring non-critical scripts, that dropped to 2.1 seconds; the add-to-cart rate rose and the page's engagement metrics improved in step. A faster page simply felt better, and that showed up in both revenue and search performance. Diagnosing issues like this is a staple of technical SEO, and the payoff surfaces as stronger user signals.