The document describes World Book Online, a subscription-based digital encyclopedia that is freely available through the Mahomet Public Library. It contains over 17,000 articles covering almost any topic and can be accessed from any device with an internet connection by entering a library card number. The tutorial demonstrates how to search for topics, view summary articles, and find additional related images, audio files, and sources through tabs and links. Assistance from reference librarians is available for help using World Book Online.