Loosely coupling the components is one of the keys to success of a framework. PowerShell follows this principle as well. All cmdlets are packaged within modules. The modules can be first-party-provided, created by you, or even third-party-created.

Installation of modules, which could've been a hassle in the past, has been streamlined today. PowerShell now comes pre-packaged with a package manager called, PowerShellGet, that connects to the PowerShell gallery (https://www.powershellgallery.com). The PowerShell gallery is an online repository that contains modules, scripts and other utilities that administrators can download and install in order to extend PowerShell's capabilities.

While it is possible to download PowerShell modules from third-party sites, our focus in this book would be the PowerShell repository.