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What are the source and destination in an Application spec? 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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What is an ArgoCD Application?

Beginner

Answer

An Application is a custom resource (CRD) that represents a deployed app in ArgoCD. It declares the source (Git repo, path, revision, or Helm chart), the destination (cluster and namespace), and the sync policy. ArgoCD uses it to fetch manifests, compare to the live state, and keep them in sync.
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: guestbook
  namespace: argocd
spec:
  project: default
  source:
    repoURL: https://github.com/org/repo
    path: guestbook
    targetRevision: HEAD
  destination:
    server: https://kubernetes.default.svc
    namespace: guestbook
Real-world example Each microservice is represented by an Application CR pointing at its manifests path and target namespace.

Common follow-ups: What are the required fields of an Application? | What is the destination server?

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All 29 Applications questions