A sticky header is a navigation bar that remains anchored at the top of the viewport as the user scrolls. By staying in view, it grants instant access to key links, search, and branding, keeping the user's orientation intact. For e‑commerce, it also keeps cart and promo cues visible, which can directly lift conversion rates without compromising the aesthetic and user satisfaction.
However, sticky headers must be lightweight and responsive. If they occupy too much vertical space or overlay content, they become a nuisance rather than a helper. Keep the bar compact, prioritize essential actions, and hide the header on mobile where space is scarce. Testing across devices ensures the experience stays smooth and that the header enhances rather than distracts from content.