As defined by Marshall University Libraries, a banned book "has been removed from a library, classroom, etc." while a challenged book "has been requested to be removed from a library, classroom, etc." 

Banned books can also include books that are deliberately not allowed to be published; books that are forbidden from an area, region, or an entire country; books not allowed to exist, often physically destroyed with public book burnings; threats to harm or kill the author of a book. 

Book bans can serve as a form of censorship, often intended to restrict different ideas, viewpoints, and perspectives. As of 2022, more recent book bans often include titles that discuss or feature sexuality, gender, race, diversity, and more. 

This guide will provide further information and context on banned and challenged books through the different tabs on the left-side of the page.