Scoring is the term that refers to the process in which a crease is applied to paper stocks and other substrates. The crease is most often used for allowing stocks to be folded easily for a variety of purposes. The applications in which scoring is necessary are numerous. Consider the following examples:
The cover of a publication becomes much easier to fold when it is scored first.
Several locations on a document can be scored to allow it to be folded into a specific size so that it can be inserted easily into an envelope.
Shipping cartons are assembled quickly when the heavy corrugated stock, of which they are constructed, is scored to allow for easy folding.