On the other hand, an intranet is a private network that is setup and controlled by an organization to encourage interaction among its members, to improve efficiency and to share information, among other things. Information and resources that are shared on an intranet might include: organizational policies and procedures, announcements, information about new products, and confidential data of strategic value.
An intranet is a restricted-access network that works much like the Internet, but is isolated from it. As is the case with the Internet, an intranet is based on TCP/IP protocols. Therefore, a web page in an intranet may look and act just like any other webpage on the Internet, but access is restricted to authorized persons and devices. In some cases, access to an intranet is restricted by not connecting it to other networks, but in other cases a firewall is used to deny access to unauthorized entities.
The difference between an intranet and the Internet is defined in terms of accessibility, size and control. Unless content filters are being used or the government is censoring content, all the Internet’s content is accessible to everyone. On the other hand an intranet is owned and controlled by a single organization that decides which members are allowed access to certain parts of the intranet. In general, an intranet is usually very small and is restricted to the premises of a single organization.