Amazon’s shiny new managed VPC NAT Gateway on AWS (unveiled today) can be translated into plain English as NAT (Network address Translation) as a service. You might wonder who is going to need it if a VPC was just fine as of yesterday.
If you are currently using NAT to connect your EC2 instances that are isolated inside a VPC to the outside world, then the answer is: you are. Even if your instances connect directly to the Internet, you might still be better off with the service than without it.