The Various Uses of SD-WAN SD-WAN which is short for software-defined networking in a wide area of network, is one of the new products of the two most important technologies namely the internet and the computer, and its main function is to simplify the management and operation of a wide area network by separating or decoupling the network hardware from its mechanism of control. One of the consumer target of the inventors of SD-WAN are business or commercial companies, and this certain technology is allowing their consumers and users to build higher performance of wide area network by enabling these businesses to either partially or wholly replace their expensive private WAN connection technologies like MPLS or multiprotocol label switching, and that is by using lower cost leased lines. The various benefits which a business company can gain from using such great modernized products includes the chance and the privilege of delivering the services and applications required to perform business functions, to connect remote branch offices to data centers and the privilege of extending their computer networks over larger distances. The products that are called as SD-WAN are designed by its manufacturers to address operational challenges or any other network problems that are existing, and some of the examples for these includes packet loss, service outage, network congestion, lower latency requirements of modern operations like video conferencing, streaming media, virtualized applications and desktops, and VoIP calling, bandwidth requirements for featuring high-definition video, difficulty and expensive costs of expanding WAN capability, difficulties in management of network and troubleshooting and jitter. In using the SD-WAN it enhances and replacing the traditional branch routers by using virtual appliances, and these appliances can control the application-level policies and offer an overlay of the networks with the use of a less-expensive consumer level internet links which acts as a dedicated circuit. The software-defined networking in a wide area of network or SD-WAN product can be a virtual appliance or physical appliance and commonly, they are being placed by the users and consumers in cloud platforms, corporate data centers, small remote offices and branch offices. The characteristics of an SD-WAN products which is a requirement for the inventors and manufacturers includes the ability of supporting multiple connection types like frame relay, MPLS or multiprotocol label switching and higher speed LTE or long-term evolution wireless connections, the ability to support VPNs or virtual private network and third party services like WAN optimization controllers, web gateways and firewalls, a simple interface that is very easy to manage, and configure the ability of doing dynamic path selection which can be used for load sharing and resiliency purposes. The SD-WAN products offers great features to their consumers and users and that includes QoS or quality of service, security, resilience, flexible deployment options, and troubleshooting and simplified administration.