SD-WAN and VPN are Wide Area Networking (WAN) technologies allowing data transmission between multiple sites. However, there are a few key differences between the two. SD-WAN is a newer technology developed in recent years in response to the increasing demand for cloud-based applications and services. It uses software-defined networking technology to create virtual networks between different locations, which allows for greater flexibility and scalability than traditional WAN technologies. VPN is a more established technology that has been around for many years. It uses tunneling protocols to create secure connections over public networks, such as the internet, allowing for confidential data transmission between different locations.