SD-WAN

SD-WAN is an acronym for software-defined networking in a 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 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 internet access, enabling businesses to partially or wholly replace more expensive private WAN connection technologies such as MPLS.

American marketing research firm Gartner predicted in 2015 that by the end of 2019 30% of enterprises will deploy SD-WAN technology in their branches.

WANs allow companies to extend their computer networks over large distances, to connect remote branch offices to data centers and each other, and deliver the applications and services required to perform business functions. When companies extend networks over greater distances and sometimes across multiple carriers' networks, they face operational challenges including network congestion, jitter,packet loss, and even service outages. Modern applications such as VoIP calling, videoconferencing, streaming media, and virtualized applications and desktops require low latency. Bandwidth requirements are also increasing, especially for applications featuring high-definition video. It can be expensive and difficult to expand WAN capability, with corresponding difficulties related to network management and troubleshooting.

...
Wikipedia