Oracle 3-Tier Kubernetes Application is a cloud-native architecture pattern implementing containerized microservices on OKE. The three-tier structure includes Presentation Tier (API gateways and Ingress controllers), Application Tier (microservices with service mesh), and Data Tier (stateful services using StatefulSets). The platform leverages OKE's managed control plane, automatic node scaling, and integration with Oracle Container Registry for deployments. Features include service mesh support, distributed tracing, comprehensive security policies, and enterprise-grade monitoring through OCI services.