An extranet is a private network of systems that a
company uses that operate outside of its own firewall.
Typically a company extranet is used for people
to connect to the company to conduct any number of
tasks behind a password protected area. A common application
of an extranet is a partner area where partners and
download sales resources such as graphics and content
to aid in the sales process.
Sometimes referred to as a portal, an extranet can
also be used to service clients who need support for
products and services purchased from the organization.
An enterprise level extranet application can be built
upon most technology available today, including dot
net, asp, php, html, and other systems.