A SharePoint library is, in essence, a list of files. However, SharePoint libraries not only store files, but provide a flexible collaboration environment for you and your team to work on these files.
A SharePoint library page lists each file in the library as well as its properties and provides a link to each file. By default, the team site comes with a built-in document library named Shared Documents that is listed on the Quick Launch bar.
In addition to the Shared Documents library, you can create your own document, picture, and form libraries when necessary. When creating a new library, you can choose to place a link to this library on the Quick Launch bar.
For more information on working with documents in document ...