Pages are collections of cards. There are four different kinds of Pages.
The note page is for simple notes that don't require any fancy data. The character page is for fictional characters. The biographer page is intended for real life living and dead people. The address book page is for organizing your addresses and phone numbers.
The most important page is the project page. You may only have one of these in a notebook at a time. The project page lets you access the submission book features of Worgan and many other nifty utilities.