Pages -vs- Sheets

One Sheet, Two Pages
One Sheet, Two Pages
A single sheet of paper has two sides. Each side is considered one page. So a sheet of paper is two pages.
One Sheet Folded, Four Pages
One Sheet Folded, Four Pages
A sheet folded in two is a four page document. Page one is the front cover, page two is the inside front, page three is the facing page, and page four is the back cover.