A Cmdlet Provider is a custom component in PowerShell that provides a set of cmdlets for working with a particular data store or resource. Cmdlet Providers are implemented as Windows PowerShell snap-ins or as Windows PowerShell modules.  To create a custom Cmdlet Provider, you will need to implement a set of cmdlets and a provider base class that implements the required functionality for the cmdlets. The provider base class can be either a PSSnapIn or a module.  Once you have implemented your Cmdlet Provider, you can use the Export-ModuleMember cmdlet to specify which cmdlets and functions in your module should be exported, and therefore made available to the user.  For example, to export a cmdlet named Get-Foo from your module, you can use the following command:  Export-ModuleMember -Function Get-Foo  To use your custom Cmdlet Provider, you can import it into your PowerShell session using the Import-Module cmdlet.  A Navigation Cmdlet is a cmdlet that enables you to navigate a hierarchical data store or resource, such as a file system or registry. Navigation Cmdlets are implemented as Cmdlet Providers, and they provide a set of cmdlets for navigating and managing the data store or resource.  To create a custom Navigation Cmdlet, you will need to implement a Cmdlet Provider as described above, and then define the cmdlets that enable navigation and management of the data store or resource.  For example, to create a Navigation Cmdlet that enables you to navigate a custom data store, you might implement cmdlets such as Get-ChildItem, Set-Location, and New-Item.  Once you have implemented your Navigation Cmdlet, you can use it in your PowerShell scripts and sessions by importing the Cmdlet Provider module.