All 28 App of Apps questions
More in App of Apps
Why use the App of Apps pattern? What does the parent Application's source point to in App of Apps? In App of Apps, what is the 'root' application? How do you install the root app to bootstrap an environment? What's the benefit of a single sync point in App of Apps? Does deleting a child app manifest from Git remove the child? How does App of Apps differ from ApplicationSets? How do you order child application deployment in App of Apps? How do you bootstrap a whole cluster with App of Apps? How does cascading deletion work with App of Apps?
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What is the App of Apps pattern?

Beginner

Answer

App of Apps is a pattern where a single parent (root) Application deploys other Application resources instead of workloads. The parent points at a Git path containing child Application manifests, so syncing the parent creates/updates all the children. It bootstraps and manages many apps from one entry point.
kind: Application
metadata: { name: root }
spec:
  source:
    repoURL: https://github.com/org/gitops
    path: apps          # directory of child Application manifests
  destination: { server: https://kubernetes.default.svc, namespace: argocd }
Real-world example A root app points at an 'apps/' directory; syncing it creates Applications for monitoring, ingress, and each service.

Common follow-ups: What does the parent app deploy? | Where do child Applications live?

Applications Multi-cluster App of Apps
All 28 App of Apps questions