Azure NAT Gateway Description
NAT Gateway is a managed service that secures the routing of internet traffic from a virtual private network. It offers enterprise-grade performance with low latency. NAT Gateway provides outbound connectivity with software-defined networking and high availability. Deploying a NAT gateway resource will allow you to connect outbound securely with enterprise-grade performance. You can assign your NAT Gateway to subnets in a single virtual network with static IP addresses. NAT Gateway will automatically use the default route for the internet when configured to a specific subnet. No traffic routing configurations are required.