Multi-AZ three-tier web application on AWS with Route 53 DNS, CloudFront CDN, WAF protection, and Application Load Balancers distributing traffic across EC2 instances in separate availability zones. Application tier uses Auto Scaling groups of t3.medium instances in private subnets, while data tier runs RDS Primary and Standby databases in db.r5.large instances with synchronous replication. This architecture eliminates single points of failure, ensures automatic failover, and meets enterprise SLA requirements for production workloads. Fork this diagram on Diagrams.so to customize subnets, instance types, or add additional services like ElastiCache or Lambda. The design demonstrates AWS best practices for fault tolerance, security layering, and cost-optimized compute selection.