How to comment PowerShell code?

You can use # to comment single line PowerShell Code and <# and #> symbols to create a multiple-line comment block in Powershell.

Single-Line Comment

# Your Comment Here in PowerShell

Example:

Get-Process -Name *host*

Multi-Line Comment

In Powershell 2.0 or above, you can make multi-line comment as below

<# 
  This is Comment
  This is also comment, line 2
  Some More text here
#> 

Example:

if (Get-Service $servicename -ErrorAction SilentlyContinue)
{
Write-Host "$servicename exists"
<#
Multi-line Comment
Here it would not execute
#>
}

Also in PowerShell ISE you can hit Ctrl+J to open the Start Snipping menu and select Comment block to add it.