SD-WAN or software-defined wide area network is a new way to manage and optimize a wide area network (WAN). It was created to overcome the high bandwidth costs and the rigidity of MPLS services. It does that by incorporating Internet transports (such as Cable, DSL, Fiber and 4G) into the WAN and forming a virtual overlay across all transports.
The SD-WAN measures the real-time transport quality (latency and packet loss) and uses Policy-based Routing (PbR) to route application-specific traffic over the most appropriate transport.
Secure, global SD-WAN, delivered as a service, provides the core benefits of SD-WAN while enabling secure direct internet access, SLA-backed connectivity, and seamless extension of the WAN to cloud datacenters and mobile users.