Amazon VPC
Virtual Private Cloud — a logically isolated section of the AWS Cloud for your resources.
Amazon VPC (Virtual Private Cloud) provisions a logically isolated virtual network within the AWS Cloud where resources such as EC2 instances and RDS databases can be launched. You define the IP address range using CIDR notation, divide it into public and private subnets across Availability Zones, and control traffic with route tables, security groups, and network ACLs.
The key exam distinction is that security groups are stateful (return traffic is automatically allowed), while network ACLs are stateless (both inbound and outbound rules must be explicitly set). Every AWS account comes with a default VPC in each Region, so services can launch immediately without custom configuration.
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