This is the top part of the page, this will display on the front page up until the “MORE” tag, which is a button on the toolbar when editing the page.  Adding the MORE tag will display the upper part on the front page, like a short description, or intro to the page.  The below half will show up after visiting the page.

This the content underneath the MORE tag.  This will only be visible when viewing the page, and not from the home page.  Use this to allow a quick intro to the page on the home page, but give more detail on the page itself.