It's more than just the world's best encyclopedia. It's also a media center where you can enjoy world-class music and photography in dozens of categories. There's an incredible amount of multimedia—an astounding 580 videos and animations, 822 audio files, plus 15,370 photos and illustrations, 2,390 maps, 2,170 tables, and 27,320 encyclopedia articles, all put together by 5,100 contributors. View historic, scientific, and entertaining videos—or listen to poetry readings, famous speeches, and so much more. The 2014 Multimedia Edition also contains an atlas with thousands of maps, plus historical information, relevant articles, and geographic statistics. And yes, this disc contains the complete 22-volume set of World Book Encyclopedia.
This is the most recent edition
—it's the 2014 edition, but there is no 2015 edition.
The 2014 World Book Multimedia Edition is a DVD-ROM, which functions similarly to a CD-ROM, except it holds much, much more information. Installation requires internet access, but this disc is both Windows and Macintosh compatible (Win XP SP2 or later, Vista, 7, 8, and 10, and Mac OS X 10.5.8 or later, including Mountain Lion).