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A command in powershell is an execution unit that can be:

• a Powershell - Alias
• a Powershell - Function
• a Powershell - Cmdlet
• a PowerShell - Script

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Documentation / Reference

• https://docs.microsoft.com/en-us/powershell/scripting/getting-started/fundamental/getting-information-about-commands?view=powershell-6