What is virtual file system in sharepoint, where are the site pages stored?

Question

I came across this paragraph in Inside Microsoft SharePoint 2010; page 126 :-
When SharePoint Foundation provisions the Proposals document library,it creates a folder named Proposals at the root of the site and then it creates a child folder named Forms.
Inside the Forms folder, it creates a set of site pages with names such as DispForm.aspx, EditForm.aspx, AllItems.aspx, and Upload.aspx. The reason that SharePoint Foundation creates site pages inside the Forms folder for each
new list and document library is that these site pages will provide users with the forms they will use to add and manage content.
My question is that:-
1) What us the root of the site means? 
2) Are the pages for edit/add/allitems created in filesystem OR in the content database?
3)Suppose we create new sitepages, then where are they stored? In filesystem or in content db?

Answer 1

Hi,
For All above queries the data and site pages are stored in content database
Root folder: A folder created for the document library under the web (sub site) and another folder created as child folder named Forms. Site pages are created in SharePoint content database
SitePages(Add/display/edit): These pages are created in SharePoint content database
Note: The SharePoint will not create any physical aspx page OR folder in the file system while creating document library.
Hope this will help you.
Senthilrajan Kaliyaperumal
But the book mentions that:-
When SharePoint Foundation provisions the Proposals document library,it
creates a folder named Proposals at the root of the site and then it creates a child folder named Forms. 
Is
this wrong? Are the folders created in filesystem or content db? If the files are not supposed to go into the filesystem, then why are the folders created?