Definition - What does Intranet mean?
An intranet is a secure and private enterprise network that shares data o application resources via Internet Protocol (IP). An Intranet differs from the internet, which is a public network.
Intranet, which refers to an enterprise’s internal website or partial IT infrastructure, may host more than one private website and is a critical component for internal communication and collaboration.
Techopedia explains Intranet
A company's intranet is based on Internet concepts and technology, but for private use. The term can refer to anything that is web-based but for private use, but typically means a company's shared web applications. For example, it is common for companies to store internal contact information, calendars, etc. on their intranet.