Environment Variables:?

Short answer: Store sensitive data such as API keys, passwords, and tokens in environment variables or secret management tools (e.g., HashiCorp Vault, AWS Secrets Manager, Azure Key Vault).

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.