WAN optimization is designed to decrease the amount of traffic an organization transmits over its corporate WAN connection. This process, sometimes called data reduction, uses a combination of de-duplication and compression to reduce the size of data transfers. The net result is a reduction in the amount of data physically sent over the wire. Once it's transmitted, the data is reconstituted on the receiving end. Historically, WAN optimization has been point-to-point between two data centers or between a remote office and a data center.