PowerShell is both a command-line shell and scripting language and perfect for automating administrative tasks. When working with Microsoft Azure, Microsoft recommends to use the new Azure PowerShell Az module. See how to uninstall the outdated Azure PowerShell AzureRM , how to install the new Az module for PowerShell 5.x and 6.x and how to connect and to get a inventory of your resources and a little bit of Cloud Shell here.
Azure PowerShell "Az" is the successor of "AzureRM"
For working with Azure PowerShell, the AzureRM module is outdated. AzureRM is still officially maintained and will get bug fixes up through December 2020, but Microsoft strongly recommends to switch to the Az module.
The new Azure PowerShell Az module is available since December 2018 and, as the documentation says, offers shorter commands, improved stability, and cross-platform support since it's running on the .NET Standard library which means it runs on PowerShell 5.x and PowerShell 6.x (PS 6.x can run on Linux, macOS, and Windows). I see, "Az" is shorter than "AzureRM"... 
Anyway, Az also offers feature parity and an easy migration path from AzureRM. See more at Introducing the new Azure PowerShell Az module.
Uninstall Azure PowerShell AzureRM
