app/router

This module configures crossroads.js, a routing library. If you prefer, you can use any other routing library (or none at all) as Knockout is designed to compose cleanly with external libraries. You *don't* have to follow the pattern established here (each route entry specifies a 'page', which is a Knockout component) - there's nothing built into Knockout that requires or even knows about this technique. It's just one of many possible ways of setting up client-side routes.