Software-Defined Wide Area Network or SD-WAN is an application of software-based network technologies to WAN connections. Its role is to effectively direct all network traffic between data centers, headquarters, remote offices, branch offices, and the cloud.
Simply put, SD-WAN is the method of combining the benefits of the cloud and the bandwidth of broadband and existing enterprise network infrastructure in order to increase efficiency when transmitting data, video, and voice. It also provides the ability to quickly access cloud applications from every location in the network.
SD-WAN utilizes a number of connections like MPLS, Broadband, LTE, dedicated internet and more to find the optimal delivery path in regards to the traffic across a given network. It eliminates any clogging and dropped data packets and thus is able to provide the best user experience no matter where you are located.