Word: Persistent Navigation

Definition: Navigation that is present on every page of a website or application, in the same location and format.

Thoughts: The consistency provided by persistent navigation is important for user way-finding and orientation. This navigation should not be confused with "sticky" navigation, that is, one that remains stuck to the top of the page while the user scrolls. Persistent navigation is all about maintaining a dependable and known element from page to page that gives the user the comfort to adventure and explore without the worry of getting lost.

Question: What is the role of persistent navigation in a world where long single webpages seems to be all the rage?