3-tier architecture, AWS cloud, modern data center, servers, routers, switches, firewalls, load balancers, relational databases, web applications, user requests, HTTP protocol, secure connections, SSL certificates, monitoring systems, logs analysis, scalability, high availability, disaster recovery, virtual private cloud, VPN connectivity, Linux operating system, containers, microservices, DevOps practices, agile development, continuous integration, Jenkins pipeline, Git version control, collaboration tools, JIRA project management, team workflow, infrastructure as code, Terraform configuration, CloudFormation templates, security groups, IAM roles, access controls, least privilege principle, auditing trails.