Pages can contain almost anything: formatted text, images, movies, audio clips, PDF files, tables, lists, web and file links, and drawings you create in Notes. There are no rules for where things have to go: put an image beside text, or under it. Draw shapes on top of other notes. Put two snippets of text right next to each other. Click anywhere and start typing. It's really that simple.
Notebooks are organized into sections (the larger tabs on the left in the image above), each of which contains as many pages as you like. All the open notebooks are shown in one window, for easy navigation and quick jumps.