Alibaba 3-Tier Kubernetes Application is a cloud-native containerized architecture pattern built on ACK (Alibaba Container Service for Kubernetes). The architecture separates application components into three Kubernetes deployment tiers: Presentation Tier with API gateways and Ingress controllers, Application Tier running microservices with sidecar proxies, and Data Tier hosting stateful services. Each tier operates as independently scalable containerized workloads within Kubernetes namespaces with network policies for security isolation.