Navigation complements search for several reasons:
- sometimes users don’t know what to search for, and need help figuring out the partitioning of the search space;
- coming up with a good query and typing it requires more mental effort and higher interaction cost than recognizing and tapping a navigation link (and, in fact, users are notoriously bad at formulating good queries );
- site search often works a lot more poorly than the search-engines users expect it to.
However, on mobile devices, both navigation and search come at a price: they occupy screen space and grab users’ attention, both of which are at an even higher premium on mobile than on desktop....