A private miniature internet, usually belonging to a single company or organization, connecting the organization’s computers together while (usually) restricting access from the internet proper.- Often just called ‘the network’.
— 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