An intranet is a network for use internally in an organisation to facilitate communication and access to information that is sometimes access-restricted. Sometimes the term intranet refers only to the most visible service, the internal web site. The same concepts and technologies of the Internet such as clients and servers running on the Internet protocol suite are used to build an intranet. HTTP and other internet protocols are commonly used as well, especially FTP and email. There is often an attempt to use internet technologies to provide new interfaces with corporate 'legacy' data and information systems.

Since about 1995, intranets have become a major growth area in corporate computing due to the availability of cheap or free commercial browser and web server software which allows them to provide a simple, uniform hypertext interface to many kinds of information and application programs. Some companies give limited access to their intranets to other companies or the general public. This is known as an "extranet".

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