Software-Defined Wide Area Network (SD-WAN) purpose is to eliminate or reduce the need for private WAN technologies like MPLS by making the WAN more responsive and less complex.
SD-WAN is an alternative and more dynamic approach to designing and deploying enterprise WAN solutions, providing greater network visibility and control. It aims to replace traditional branch routers with appliances that use visualisation, application-level policies and network overlays to make several broadband internet links behave like a dedicated managed circuit.