Pages can be seen as a note with a title. But pages also incorporate the notion of hierarchy which is particularly useful to organize a lot of information.
When it comes to storing long-term information, pages are particularly adapted, often non-actionable (until it becomes actionable). In addition, pages can be organized hierarchically by dragging a page onto another one or by using the + button next to a page name.
Pages are particularly useful thanks to Routine's ability to embed full-fledged tasks in notes (see 
Routine provides some templates to get you started with pages: from organizing your housework, planning your next vacation, defining a bucket list, storing the contact of your plumber and electrician, etc.
Contact) or through the app.