Security Zones:Interanet

Intranets are private networks implemented and maintained by an individual company or
organization. You can think of an intranet as an Internet that doesn't leave your company;
it's internal to the company, and access is limited to systems within the intranet. Intranets use the same technologies used by the Internet. They can be connected to the Internet but can't be accessed by users who aren't authorized to be part of them; the anonymous user of the Internet is instead an authorized user of the intranet. Access to the intranet is granted to trusted users inside the corporate network or to users in remote locations.