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What is an ArgoCD Application? What manifest formats/tools does ArgoCD support for an Application source? How do you view and manage Applications via the ArgoCD CLI? What namespace do ArgoCD Application resources live in? What is the targetRevision HEAD and when should you avoid it? How do you deploy a Helm chart with ArgoCD and override values? How do you use Kustomize with an ArgoCD Application? What is the difference between manual and automated sync policy? What does the prune option do in a sync policy? What is selfHeal and when should you use it?
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ArgoCD › Applications

What are the source and destination in an Application spec?

Beginner

Answer

The source defines where the desired manifests come from: repoURL, path (for plain/Kustomize/Helm-in-repo), and targetRevision (branch, tag, or commit). The destination defines where to deploy: the cluster (server URL or name) and the target namespace. Together they map 'what to deploy' to 'where to deploy it'.
source:
  repoURL: https://github.com/org/repo
  path: apps/web
  targetRevision: main
destination:
  server: https://kubernetes.default.svc
  namespace: web
Real-world example An Application pulls from the main branch's apps/web path and deploys into the web namespace of the local cluster.

Common follow-ups: What can targetRevision be? | How do you target a remote cluster?

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