The Pages area of the Owin Framework provides very scalable and flexible methods of adding web pages and web service endpoints to any Owin Framework application.
This Framework package provides the default implementation of many of the interfaces defined in the core. Most applications that use the Pages functionality will use this package. This exists as a package in case there are people who want to write a customized version of the framework and still put the page rendering engine on top for example.
Since the whole Owin Framework uses Dependency Injection throughout, you can also include this package into your application and overrride any concrete interface implementation using IoC.