# What is an overlay in Kustomize?

Kustomize, Easy (Beginner), Concepts. https://k8wiz.com/uquiz/what-is-an-overlay-in-kustomize

- A. A kustomization that builds on a base and adds one environment's changes
- B. A Helm values file that is layered on top of the chart's own default values
- C. A Git branch that holds the manifests for one environment only
- D. A namespace that receives a copy of every resource in the base

**Answer:** A kustomization that builds on a base and adds one environment's changes

**Explanation:** A typical layout has a base with the shared manifests and overlays such as overlays/dev and overlays/prod. Each overlay lists the base under resources and adds patches, a namespace or image tags. The base knows nothing about its overlays.