Wikipedia
SD-WAN
SD-WAN is an acronym for Software Defined Wide Area Network (WAN). An SD-WAN simplifies the management and operation of a WAN by decoupling (separating) the networking hardware from its control mechanism. This concept is similar to how software-defined networking (SDN) implements virtualization technology to improve data center management and operation.
A key application of an SD-WAN is allowing companies to build higher performance WANs using lower cost leased lines, enabling businesses to partially or wholly replace more expensive private WAN connection technologies such as MPLS.
American research and advisory firm Gartner predicted in 2015 that by the end of 2019 30% of enterprises will deploy SD-WAN technology in their branches.