What’s the difference with quotes?
Single quote: It is taken literally and provided back.
Double quotes: PowerShell looks for the $ character inside of the double quotes. Once found, it assumes the following characters are the name of a variable up to the first space, is a variable name.
Sample:
[System.String]$a = 'Hello'
$b = '$a World!'
# $b prints: $a World!
$c = "$a World!"
# $c prints: Hello World!
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