SD-WAN (Software-Defined Wide Area Network) is a specific application of software-defined networking (SDN) technology applied to WAN connections such as broadband internet, 4G, LTE, or MPLS. SD-WAN works on the principle of WAN virtualization, So it either uses the internet or cloud-native private network. On the other hand WAN technology uses special proprietary hardware which is more expensive. Enterprises are demanding for SD-WAN due to the flexibility it offers, rather than installing proprietary or specialized WAN technology that often involves expensive, proprietary hardware.