There are five basic file formats—AI, PDF, EPS, FXG, and SVG—to which you can save artwork. These formats are called native formats because they can preserve all Illustrator data, including multiple artboards. (For PDF and SVG formats, you must select the Preserve Illustrator Editing Capabilities options to preserve all Illustrator data.) EPS and FXG can save individual artboards as separate files. SVG saves the active artboard only; however, the content from all artboards is displayed.
from:
http://help.adobe.com/en_US/illustrator/cs/using/WS714a382cdf7d304e7e0 7d0100196cbc5f-6561a.html
