Original: Wikibooks (previously called Wikimedia Free Textbook Project and Wikimedia-Textbooks) is a Wiki hosted by the Wikimedia Foundation for the creation of free content textbooks and annotated texts that anyone can edit.
Simplified: Wikibooks (previously called Wikimedia Free Textbook Project and Wikimedia-Textbooks) is a collection of free books. It is one of many projects that are run by the Wikimedia Foundation.