A bleed is extra ink or graphics that surpass the trim line to allow for variations in cutting or finishing. This is typically a ⅛” (0.125″) extension of the artwork on all four sides. If artwork goes all the way to the edge, the file needs to include a bleed in the final submitted artwork. This can be referred to as “bleeding off the edge.”
Learn how to export and package your files with crops and bleeds here.