The printed area which extends off the trimmed area.
It is not possible to print all the way to the edge
of a sheet of paper or disc. To achieve this effect, it is necessary
to print a larger area than is required and then trim the paper
down. When producing discs, the bleed will ensure your artwork sits
in the print templates correctly and attains the maximum print area
possible, leaving no white marks. Typically a designer would allow
an extra 3mm of bleed to allow for a little leeway when trimming.