Classic three-tier AWS architecture spanning six subnets across two Availability Zones for high availability. Internet traffic flows through an Application Load Balancer in public subnets, distributing requests to EC2 instances managed by an Auto Scaling Group in private subnets. The data tier features RDS PostgreSQL with synchronous replication to a read replica, while EC2 instances offload static assets to S3. Fork this diagram on Diagrams.so to customize instance types, add CloudFront, or swap RDS for Aurora.