Pages are the documents you create inside your workspace. They are composed of Blocks and there are a few different types of Pages.
A Document is a standard text document where blocks are stacked top to bottom down the page.
A Surface is a free-form text document where blocks can be positioned on an infinite canvas. They give you access to special types of blocks that can be used to sketch idea, build diagrams, mind-maps, wireframes, and more. See Surfaces for more details.
A Folder is an organizational unit. They provide a list view of the Pages within it and allow you to perform bulk actions on them.
A Daily Notes page is a dynamic document associated with a particular date to help keep your days organized. See Daily Notes for more details.