> ## Documentation Index > Fetch the complete documentation index at: https://docs.prequel.co/llms.txt > Use this file to discover all available pages before exploring further. # Environments > Learn about the built-in Prequel environments ## What are the Prequel environments? Every Prequel account is provisioned with two environments: `staging` and `prod`. Functionally, they behave the same, but with a few key differences. | Considerations by Environment | `prod` | `staging` | | :---------------------------- | :--------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Support** | Standard SLA as guaranteed in Service Agreement. | Prequel SLAs do not apply to `staging` environments. Tactically, this means Prequel support is not monitoring `staging` environments, and will not actively detect or respond to issues. | | **Billing** | Billed according to your Service Agreement. | Prequel does not bill for `staging` usage. | | **Product** | Schema evolution considerations mean column data types cannot be modified (only added/removed) | Schema evolution features are not enabled. Modifying column data types may break transfers until a `full_refresh` is performed. | ## Switching between `staging` and `prod` environments ### API keys: `sk_staging_*` vs. `sk_prod_*` API keys beginning with `sk_staging_` will automatically route your request to your `staging` environment. API keys beginning with `sk_prod_` will route requests to `prod`. ### Admin UI toggle In the Admin UI, the toggle at the bottom left of the screen can be used to switch between or verify environments. ![](https://storage.googleapis.com/prequel_docs/images/ui-admin-environments-toggle.png)