Multi-tier Azure web application architecture combines Azure Front Door for global load balancing with Application Gateway for regional WAF protection. Traffic flows from users through Azure Front Door to Application Gateway in a public subnet, routing requests to App Service in a private subnet. App Service connects to Azure SQL Database with Azure Cache for Redis for session state, while Azure Monitor provides unified observability across all layers. This design demonstrates defense-in-depth security with dual load balancing tiers and private network isolation for backend services. Fork this diagram on Diagrams.so to customize subnet configurations, add Traffic Manager policies, or integrate Azure Key Vault for secrets management.