The World Book Encyclopedia is written by more than 4,000 scholars and experts who act as contributors, reviewers and consultants. The encyclopedia is reviewed by an advisory board of 14 scholars before publishing.
World Book, Inc. was founded in 1915. The original World Book Encyclopedia was printed in 1917 and contained eight volumes totalling 6,300 pages. A new edition of The World Book Encyclopedia is printed yearly. The encyclopedia tracks print publishing trends, aiming to teach complicated topics without the technical jargon of other encyclopedias.
World Book Online, later renamed The World Book Online Reference Center, was first made available in 1999. As of 2015, World Book offers its knowledge base in print, eBooks, iPad apps, websites and children's books. More than 22 products are available online, most of which are optimized for tablets.