Sticky navigation is a menu bar that stays pinned to the top of the screen while the visitor scrolls down a page. The content moves, but the navigation does not, so the main links stay one click away no matter how far someone has read.
Think of the dashboard in a car. You can drive for hours, but the speedometer and controls never disappear from view. A sticky navigation bar plays the same role on a website: the route options stay in front of you the whole time. It pairs well with a clear navigation structure, because the bar is only useful if the links behind it are sensibly grouped.
There is a balance to strike. On a phone, a bar that is too tall eats into the content people came to read, so the height and what you keep visible matter. Good sticky headers shrink slightly on scroll, hide secondary items, and adapt with responsive design so they feel light rather than intrusive.
Two practical traps catch people out. The first is anchor links: when you click a jump link, a sticky bar can sit on top of the heading you landed on, so you need a little scroll-margin to push it clear. The second is iOS Safari, where the on-screen keyboard and the changing address bar can make a fixed element jump. Both are fixable, but they are why a sticky header is worth testing on real devices rather than assuming it just works. It is not always the answer, on a short page it adds clutter for no gain.
At TopDevs we use sticky navigation where it earns its place, like long landing pages and shops, and keep it compact so it guides visitors without crowding the screen.
