VPC is virtual private cloud
VPC is a logical private data center
VPC needs Internet Gateway(IGW), Route tables, Network ACLs, Subnets, Security Groups
1 subnet = 1 Availability zone (AZ)
You can peer VPC to another VPC, even within different AWS accouts.
VPC A is peered to VPC B, VPC A is peered to VPC C, BUT VPC B is NOT PEERED to VPC C