What is bleed?
The bleed is the margin extending beyond the final format of the print product and will be trimmed by the cutting machine. Print-ready artwork refers to the finished size of your printed product including the bleed. Without bleed, you can have a white border margin around the trim edge. To prevent this, any elements that will print to the edge of the finished product should be extended beyond this edge out to the bleed edge.
If not specified otherwise, add 0.1 inch of circumferential bleed to your print files.