In addition to specifying different artboards to crop artwork for output, you can also create and use multiple sets of crop marks within your artwork. Crop marks indicate where you want the printed paper to be cut. Crop marks are useful when you want to create marks around several objects on a page—for example, when printing a sheet of business cards. They are also helpful for aligning Illustrator artwork that you’ve exported to another application.
Crop marks differ from the artboard in the following ways: