This document discusses young adult literature and provides definitions and characteristics. It begins by defining young adult literature as books written for teenage audiences that deal with issues relevant to teenagers such as relationships, identity, and life decisions. The document then discusses debates around what constitutes young adult literature and provides three common definitions: 1) books for readers aged 12-18, 2) anything teenagers read voluntarily, and 3) anything marketed as young adult by publishers. It also notes some historical negative views of the genre. The rest of the document explores the content and evolution of young adult literature over time through examples and studies.