MPLS Networks, while reliable, generally have a high per-megabit bandwidth cost. In other words, the MPLS links are expensive. A true MPLS solution requires expensive data links to the MPLS provider's core network where they can then configure all your connections to talk to each other. This is a tried and proven system that has great merit and many organisations could not function without their MPLS.
SD-WAN provides the same functionality as an MPLS network and we call this a Private WAN. A Private WAN allows you to connect multiple sites using any internet link available at the site. Because SD-WAN works over the top of the WAN connections, it does not matter the type of service or who the provider is. The Private WAN will assign each site a Private IP address, implement 1: 1 NAT across the network and allow you to configure Internet Gateways or local breakout if you don't want certain traffic being sent across the Private WAN. Private WANs can be linked to colocation or cloud service providers. On top of this, the whole Private WAN network will use data encryption for added security.
This means that you can bring a new site securely into a Private WAN simply by deploying an SD-WAN Node to the site. And you can then instantly monitor that site through the SD-WAN Portal.