a computer network used to share information, operational systems, or computing services within an organization
An intranet is a computer network that uses Internet Protocol technology to share information, operational systems, or computing services within an organization. The term is used in contrast to internet, a network between organizations, and instead refers to a network within an organization. Sometimes, the term refers only to the organization's internal website, but may be a more extensive part of the organization's information technology infrastructure, and may be composed of multiple local area networks.
Questions having the intranet tag regards User Experience on Intranet.
Reference: http://en.wikipedia.org/wiki/Intranet