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`/docs/concepts/environment-variables` does not exist. Similar pages:

- [Environment variables](/docs/environment-variables.md): Environment variables are keyvalue pairs configured outside your source code so that each value can change depending on the Environment. These values
- [Managing environment variables](/docs/environment-variables/managing-environment-variables.md): Environment variables are keyvalue pairs configured outside your source code so that each value can change depending on the Environment. Changes to
- [Create one or more environment variables (Vercel SDK)](/docs/rest-api/sdk/projects/create-one-or-more-environment-variables.md): POST /v10/projects/{idOrName}/env Create one or more environment variables for a project by passing its key, value, type and target and by specifying
- [Create one or more environment variables](/docs/rest-api/projects/create-one-or-more-environment-variables.md): POST /v10/projects/{idOrName}/env Create one or more environment variables for a project by passing its key, value, type and target and by specifying
- [Sensitive environment variables](/docs/environment-variables/sensitive-environment-variables.md): Sensitive environment variables are environment variables whose values are nonreadable once created. They help protect sensitive information stored

All pages: [/llms.txt](/llms.txt)