What is SD-WAN? from Jack prabha's blog

Software-Defined Wide Area Networking (SD-WAN) is a transformational approach to simplify branch office networking and assure optimal application performance.Unlike traditional WANs, SD-WAN delivers increased network agility and cost reduction. SD WAN has its roots in Software-Defined Networking (SDN), the underlying principle of which is to abstract the network hardware and transport characteristics from the applications that use the network