Fill in the blank with the appropriate term.
A ________________ is a unique combination of numbers and letters. This combination is used during Microsoft software installation to “unlock” or open the product.

Answer: Product Key

Explanation:
A product key is a unique combination of numbers and letters. This combination is used during Microsoft software installation to “unlock” or open the product. The product may not open until the product key is entered. The product key is not a product ID (PID) number. A PID is created after a product is successfully installed.