Gateways

We talked earlier about how gateways allow networks to talk to each other. AWS also provides some special gateways that simplify building your solutions:

• Internet gateway: As the name implies, the internet gateway (IGW) provides a single ingress/egress point from your VPC to the public internet. 
• VPN gateway: A VPN gateway (VGN) gives the VPC a single route to a virtual private network. This may be back to your home data center, a partner endpoint, or any connection that requires in-transit encryption.
• NAT gateway: The NAT gateway can be used to send all outbound traffic through a single IP address. This reduces the need for public IP addresses for your instances. It lowers the vectors of attack for malicious actors and script-kiddies alike.