For some types of documents, the author is not allowed to publish the document by herself. If this is the case, you must configure the document library to activate Content Approval. The effect is that every added or modified document is hidden until a user with Manage Lists rights approves it. Even if the author has this right, the document must be approved in a separate step.
Try It Out: Activate Content Approval in a Document Library
The approval process is now activated. Log on as a user who is a member of the SharePoint Members group. This group does not have the Approve permission, so every update from these members will need to be approved by a user with this right (for example, the Owners group, and the site administrator).
Note that even if a user with Approve permission adds or modifies a document, it must still be approved. This was not the case in SharePoint 2003.
Try It Out: Test the Content Approval Process