Multi-tier architecture, cloud computing, AWS, modern data center, enterprise-level, scalable, secure, highly available, 3-tier architecture, web tier, application tier, database tier, load balancer, auto scaling, EC2 instances, RDS database, S3 storage, Elastic Beanstalk, API Gateway, Lambda function, security groups, IAM roles, CloudWatch monitoring, alarm system, DevOps pipeline, CI/CD integration, agile development, microservices architecture, containerization, Docker containers, Kubernetes orchestration, service mesh, Istio, observability, tracing, logging, analytics.