Bleed refers to printing that goes beyond the edge of the media after trimming. The bleed is the part on the side of
your document that gives us that small amount of space to move around paper and design inconsistencies.

If for example, you want the background of your business card to be entirely red, you must extend or bleed the background beyond the edge of the final size of your business card. This also applies to images that you want to
extend to the edge of your media. If you do not add bleed you may end up with a fine white line down one or more
edges of your print! Please include at least 2mm bleed on each side of your artwork.

Please also make sure you keep your text at least  3mm from the edge of your artwork.