Which command retrieves help information for a cmdlet in PowerShell?

The command that retrieves help information for a cmdlet in PowerShell is Get-Help. This cmdlet is specifically designed to provide detailed information about cmdlets, including their syntax, parameters, and examples of how to use them effectively. By using Get-Help followed by the name of a specific cmdlet, users can access descriptions of what that cmdlet does and how to utilize it in their scripts.

For example, if someone wants to understand how the Get-Process cmdlet works, executing Get-Help Get-Process will show comprehensive guidance, which is vital for users wishing to learn and utilize PowerShell functions efficiently.

The other choices serve different purposes: Get-Command retrieves all cmdlets and functions available in the current session, which helps users find cmdlets but does not provide help information. Invoke-Help is not a standard cmdlet in PowerShell and does not perform any function related to retrieving help. Show-Command displays a graphical representation of a cmdlet's parameters, which is useful for constructing commands but not for accessing help content directly.