noun. An extension of an institution's intranet, especially over the World Wide Web, enabling communication between the institution and people it deals with, often by providing limited access to its intranet.

noun. A private computer network that uses Internet protocols and can be accessed by authorized individuals via the Internet.

"The extranet was a great tool for use to organize the documents for our client and allowed the purchaser easy access to the documents."

internet  intranet  

client/server  cross-domain  forms-based  hop-by-hop  host-based