Azure 3-Tier Load Balancer implements a comprehensive load balancing architecture for complex multi-tier applications using Azure's load balancing services (Load Balancer, Application Gateway, Traffic Manager). The presentation tier uses Application Gateway for Layer 7 HTTP/HTTPS routing with advanced capabilities, the application tier uses Load Balancer for Layer 4 TCP/UDP distribution, and optionally implements Traffic Manager for global routing across regions. The architecture provides automatic failover, health checks, SSL/TLS termination, WAF protection, and seamless integration with App Service, VMs, and other Azure compute resources.