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Intranet is a term for the internal computer network of an organization that uses network technologies and follows the same standards as internet (hypertext and TCP/IP protocols) to facilitate communication and data sharing within the organization.
It refers to network within an organization, contrary to network between organizations as provided by internet. However intranets can provide internet access. Intranet involves a restricted computer network, controlled and used by an organization like a corporate private network. Intranets can connect from anywhere and have separate infrastructure, separate from internet. They use se standard network hardware and software technologies (Ethernet, Wi-Fi, TCP/IP, Web browsers and Web servers).
Also comparing, extranet comprises of a restricted computer network connecting two or more intranets (though access to certain areas of the intranet can be restricted). The main purpose of intranet is to share knowledge and resources among the employees of an organization. This is done by providing a secure platform for storing and sharing information like Network folders (multiple employees can access) , offline websites (to test functionality before going live), digital reference databases, internal email systems and instant messaging software.