The PowerShell Gallery
The PowerShell Gallery is the central repository for PowerShell content. In it, you can find useful PowerShell modules containing PowerShell commands and Desired State Configuration (DSC) resources. You can also find PowerShell scripts, some of which may contain PowerShell workflows, and which outline a set of tasks and provide sequencing for those tasks. Some of these packages are authored by Microsoft, and others are authored by the PowerShell community.
The PowerShellGet module contains cmdlets for discovering, installing, updating and publishing PowerShell packages which contain artifacts such as Modules, DSC Resources, Role Capabilities and Scripts from the PowerShell Gallery and other private repositories.
Getting Started with the Gallery
Installing packages from the Gallery requires the latest version of the PowerShellGet module. See Installing PowerShellGet for complete instructions.
Check out the Getting Started page for more information on how to use PowerShellGet commands with the Gallery. You can also run Update-Help -Module PowerShellGet to install local help for these commands.
Supported Operating Systems
The PowerShellGet module requires PowerShell 3.0 or newer.
PowerShellGet requires .NET Framework 4.5 or above. You can install .NET Framework 4.5 or above from here.
Since PowerShell Core is cross-platform and that means it works on Windows, Linux and MacOS, that also makes PowerShellGet available on those systems. For a full list of systems supported by PowerShell Core see Installing PowerShell.
Many modules hosted in the gallery will support different OSes and have additional requirements. Please refer to the documentation for the modules for more information.