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Maven / GitHub Actions Interview Questions

What is the difference between the env:, secrets:, and vars: contexts in GitHub Actions?

All three hold key-value configuration but differ in storage location, security characteristics, and intended use.

env vs secrets vs vars Contexts
Context Where it is defined Encrypted at rest? Visible in logs? Typical use
env: Inline in the workflow YAML (workflow/job/step scope) No — plain text in the repo Yes Non-sensitive config like feature flags, version numbers, region names embedded directly in YAML
secrets: Repository / Organisation / Environment Settings → Secrets Yes — encrypted by GitHub No — masked as *** Passwords, API keys, tokens, certificates — anything that must not be readable in the YAML or logs
vars: Repository / Organisation / Environment Settings → Variables No — stored as plain text Yes Non-sensitive config that should be managed in the GitHub UI without editing YAML (e.g. target environment URL, Node version to use across many workflows)

The key distinction between env: and vars: is that vars: are managed in the GitHub UI and shared across workflows without touching YAML files, whereas env: values are hardcoded in the YAML itself. Use vars: when you want non-engineers to be able to change configuration without a pull request.

Access syntax: ${{ secrets.MY_KEY }}, ${{ vars.MY_VAR }}, ${{ env.MY_ENV }}.

Which context should you use for storing a database password in GitHub Actions?
What is the main advantage of vars: over env: for non-sensitive configuration?

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