SharePoint-based Web sites can be password-protected to restrict access to registered users, who
are invited to join via e-mail. In addition, the site administrator can restrict certain members' roles
by assigning different permission levels to view post and edit.

Security levels are assigned by the administrator who is adding the user. There are four levels by
default and additional levels can be composed as necessary.

1. Reader - Has read-only access to the Web site.
2. Contributor - Can add content to existing document libraries and lists.
3. Web Designer - Can create lists and document libraries and customize pages in the Web site.
4. Administrator - Has full control of the Web site.

User permissions apply to an entire Web, not to documents themselves. However, you can have
additional sub webs that can optionally have their own permissions. Each user can be given any of
four default roles. Additional roles can be defined by the administrator.

An internet site is a normal site that anyone on the internet can access (e.g., www.msn.com, www.
microsoft.com, etc.). You can set up a site for your company that can be accessed by anyone
without any user name and password.
An intranet (or internal network), though hosted on the Web, can only be accessed by people who
are members of the network. They need to have a login and password that was assigned to them
when they were added to the site by the site administrator.

A user can be assigned one of the following roles
* Reader - Has read-only access to the Web site.
* Contributor - Can add content to existing document libraries and lists.
* Web Designer - Can create lists and document libraries and customize pages in the Web site.
* Administrator - Has full control of the Web site.

The person responsible for configuring and administering the enterprise's computers, networks, and software systems.