Inside pages are between the Front Cover and Back Cover pages.
They are mainly the book manuscript pages that you can add and have page numbers. But the Title Page and Credits Page are also considered inside pages because they are inside of the cover pages.
The Pages
pane in the
Edit
tab distinguishes the cover pages from the inside pages with different
colors.
The
Publish tab distinguishes the cover
pages from the inside pages so you have the option of printing the
cover pages and inside pages on different paper.
Page numbers in the published book appear after the Credits Page.
You can choose the page number style.