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# Defining and assigning values to variables in PowerShell
$greeting = "Hello, PowerShell!"
$number = 42
$isEnabled = $true

Variables in PowerShell allow you to store and reuse data throughout your scripts. When naming variables, follow these rules:

Start the name with a dollar sign ($);
The first character after $ must be a letter or underscore;
Use only letters, numbers, and underscores in the name;
Avoid spaces and special characters;
Variable names are not case-sensitive. Variable scope determines where a variable can be accessed. Most variables you create are local to your script or session, but you can specify other scopes like global: or script: if required.


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# Variable interpolation in PowerShell strings
$name = "Sam"
$message = "Welcome, $name!"
Write-Output $message  # Output: Welcome, Sam!

1. Which of the following is a valid variable name in PowerShell?

2. What is variable interpolation in PowerShell strings?

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