Answer:
It allows Windows to run script files.
Explanation:
A cmdlet is an abbreviation for command-let and it is a special type of lightweight command that is typically used with the Microsoft Windows PowerShell script for the automatic performance of a single-specific function on a computer system.
In this scenario, you have booted a new computer (purchased from a manufacture) to PowerShell prior to the computer starting the Out-of-Box Experience. From PowerShell, you run the Set-ExecutionPolicy Unrestricted cmdlet. Thus, the function of this cmdlet is to allow Windows run script files known as scripts which have been typed into the command line.
