Neptune employs a hierarchy of nodes, pages and content items to organize your site and determine which content is published at any given moment.

Nodes are places in the site navigation. When you look at the site map, you are looking at the currently active nodes on your site. Most of those nodes will link pages, but some may link external URLs, or redirect to nodes lower down in the hierarchy.

Pages are what hold your content, and there is one page per node. A page fills the browser window. Every page must have a selected layout, which consists of one or more content panes. This particular page layout has two content panes: a wide one on the left and a narrower one on the right.

Content items are the actual elements of content, placed one per content pane. The content you see here, from "Neptune employs..." down to the bottom, is a single content item in the left pane of this page. A second content item ("Some repeated content...") is in the right pane.

Since content is independent of pages, which are independent of nodes, Neptune gives you amazing flexibility in presenting your content on your site. You can repeat content on multiple pages and schedule pages to appear at a given time and disappear or be replaced at a later time.