a closed network of Web sites and e-mail systems that is open to people outside as well as inside an organization. An extranet enables third-party access to internal applications or information—usually subject to some kind of signed agreement. This is useful for organizations that need to share internal systems and information with potential partners. As with intranets, extranets provide all the benefits of Internet technology (browsers, Web servers, HTML, etc.) with the added benefit of security, being confined to an isolated network.
     Because this is a work environment and partners enter it to access information as quickly as possible, extranet design generally focuses on minimal graphics and maximum content. Security being a key issue, it is generally password-protected in order to maintain confidentiality. Content management is also essential, as the extranet is only as useful as the information it contains. Many extranets fall down because the content is not updated and managed properly.

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