The Internet has captured world attention in recent years. In reality, growth of internal networks based on Internet technologies known as the Intranet is outpacing the growth of the global Internet itself.

An Intranet is a company-specific network that uses software programs based on the Internet TCP/IP protocol and common Internet user interfaces such as the web browser. Simply put, an Intranet is the application of Internet technologies within an organization private LAN or WAN network.

The Intranet environment is completely owned by the enterprise and is generally not accessible from the Internet at large. Today, many Intranets are built around Web servers delivering HTML pages.
mais info