In the world of printing, Scoring refers to the process of making a crease in paper so it will fold easier.
Basically, a paper score is a ridge that is indented into the paper where the fold line will occur. This indention is made using a blunt metal edge – from either a wheel or a rule – that compresses the paper fibers to create a hinge-like area. This “hinge” is what allows for smoother folding.
Scoring also helps improve the appearance of the fold because it provides a consistent guideline as well as reduces the potential for the paper to buckle or crack. In addition, scored paper is less likely to cause harm to toner-type inks or thicker clear coats during the folding operation.