You're loading paper into a tractor-feed printer, which necessitates aligning the holes with pins on the paper-forwarding mechanism. What kind of printer do you have?

An impact printer normally requires paper that feeds at a consistent rate at all times. To do this, the paper will be pierced on the outside edges and fed into the printer through a tractor-feed mechanism. Thermal printers create images using specific paper and heat, whereas laser printers employ the electrophotographic technique. Drops of ink are sprayed onto paper using inkjet printers.