A network within an organization that uses Internet technologies and protocols, but is available only to certain people, such as employees of a company.
— Computer ScienceAn intranet is a constrained version of the Internet usually owned and controlled by a single company or organisation. Intranets can still be world-wide, use- TCP/IP- protocols, and be structured as a collection of networks but the greatest difference is that access is limited to a set of authorised users using firewalls and other mechanisms.
— Computer Science