Three-tier AWS architecture separating web, application, and database layers across public and private subnets within a VPC. Internet traffic flows through an Application Load Balancer to EC2 instances managed by Auto Scaling Group in the application tier. The database tier uses RDS PostgreSQL with read replica for high availability, while S3 serves static assets. This pattern demonstrates AWS best practices for fault tolerance, horizontal scaling, and network isolation. Fork this diagram on Diagrams.so to customize instance types, add caching layers, or adapt for your workload.