AWS Secure Three-Tier Multi-AZ Architecture combines CloudFront, WAF, and Route 53 at the edge to protect and distribute user traffic across two availability zones. Application tier runs ECS Fargate containers behind Application Load Balancers, while data tier isolates RDS Aurora and ElastiCache with read replicas for resilience. Private subnets enforce least-privilege network segmentation, with Secrets Manager and KMS encryption protecting sensitive data and credentials. This pattern demonstrates production-grade security, high availability, and disaster recovery best practices for enterprise workloads. Fork and customize this diagram on Diagrams.so to match your VPC CIDR ranges, AZ selections, and scaling requirements.