> For the complete documentation index, see [llms.txt](https://docs.cloudtruth.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cloudtruth.com/configuration-management/parameters.md).

# Parameters

CloudTruth Parameters allows management of parameters from a central source. This enables reeling in complicated and scattered configuration sprawl. Here is a list of how to manage parameters and the additional features we provide beyond simply providing a centralized parameter storage solution.

* Standard (non-secret) and Secret Parameters
* [Internal](/configuration-management/parameters/parameter-management/managing-parameters.md) and [External](/configuration-management/parameters/parameter-management/external-values.md) Parameter Value types
* [Comparison of Values](/configuration-management/parameters/compare-values.md)
* [History of Values](/configuration-management/parameters/history-of-values.md)
* [Validation of Values](/configuration-management/parameters/rules-and-type.md)
* [Expiration of Values](/configuration-management/parameters/value-expiration.md)

CloudTruth Parameters exist across all [Environments](/configuration-management/environments.md) in a project. Parameters are always scoped to the selected [Project](/configuration-management/projects.md). There are two parameter value types:

| Parameter                                                                                | Definition                                                                                                                                                   |
| ---------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| [Internal](#adding-an-internal-parameter-value)                                          | User-defined parameter and value where values can be static or dynamically reference other CloudTruth objects (project, environment, other parameters, etc.) |
| [External](/configuration-management/parameters/parameter-management/external-values.md) | Automatic parameter and value retrieved from an external source using a CloudTruth [integration](/configuration-management/integrations/aws.md)              |

{% hint style="info" %}
Once created, parameters cannot be converted between secret and standard parameter types.
{% endhint %}


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