# 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](https://docs.cloudtruth.com/configuration-management/parameters/parameter-management/managing-parameters) and [External](https://docs.cloudtruth.com/configuration-management/parameters/parameter-management/external-values) Parameter Value types
* [Comparison of Values](https://docs.cloudtruth.com/configuration-management/parameters/compare-values)
* [History of Values](https://docs.cloudtruth.com/configuration-management/parameters/history-of-values)
* [Validation of Values](https://docs.cloudtruth.com/configuration-management/parameters/rules-and-type)
* [Expiration of Values](https://docs.cloudtruth.com/configuration-management/parameters/value-expiration)

CloudTruth Parameters exist across all [Environments](https://docs.cloudtruth.com/configuration-management/environments) in a project. Parameters are always scoped to the selected [Project](https://docs.cloudtruth.com/configuration-management/projects). 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](https://docs.cloudtruth.com/configuration-management/parameters/parameter-management/external-values) | Automatic parameter and value retrieved from an external source using a CloudTruth [integration](https://docs.cloudtruth.com/configuration-management/integrations/aws) |

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


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