Three-tier AWS web application architecture with Route 53 DNS, Application Load Balancer, and Auto Scaling Group for high availability. User traffic flows from browsers through Route 53 to the ALB, which distributes requests across EC2 or ECS instances managed by Auto Scaling. RDS PostgreSQL provides managed relational database services with automated backups and Multi-AZ failover capability. This pattern demonstrates AWS best practices for building resilient, cost-effective web applications that scale with demand. Fork this diagram on Diagrams.so to customize instance types, add caching layers, or integrate with your CI/CD pipeline.