What is bleed in printing?

Bleed is the printing term that refers to printing that goes beyond the edge of the sheet of paper. It is difficult to print all the way to the edge of the paper, so it is necessary to print a slightly larger area than what is needed and then trim off a small amount (usually 1/8”) allowing the  print to go to the edge of the paper. It gives the appearance that ink “bleeds” off the page.