Software-Defined WAN (SD-WAN) What is Software-Defined WAN (SD-WAN)? Software-Defined WAN (SD-WAN) is a virtual networking solution that simplifies the management and operation of a wide-area network by decoupling the networking hardware from its control mechanisms. Explanation SD-WAN uses intelligent software to prioritise traffic, optimise performance, and reduce costs by leveraging multiple connection types, such as MPLS and broadband. Practical Example of SD-WAN A healthcare provider uses SD-WAN to connect its remote clinics to centralised systems, ensuring secure, reliable access to patient data.