Three-tier AWS web architecture with ALB distributing HTTPS traffic across Auto Scaling EC2 instances in private subnets. Application tier connects to RDS PostgreSQL with read replica for database scaling and S3 for static asset delivery. This pattern demonstrates AWS best practices for high availability, security isolation, and horizontal scaling. Fork this diagram on Diagrams.so to customize subnet configurations, add CloudFront, or adapt for your workload. Read replicas offload read-heavy queries while the primary handles writes.