"13 Reasons Why" is a popular American teen drama web television series developed by Brian Yorkey for Netflix. The show premiered in 2017 and ran for four seasons until its conclusion in 2020. The series is based on the 2007 novel "Thirteen Reasons Why" by Jay Asher and its subsequent adaptation into a film.

Throughout the series, the narrative jumps back and forth between Clay listening to the tapes and the events leading up to Hannah's death. The show explores the complexities of Hannah's life, including her relationships, friendships, and experiences that contributed to her decision.

The show revolves around the story of Hannah Baker (played by Katherine Langford), a high school student who takes her own life. Before her death, Hannah records a series of cassette tapes, each containing a different reason why she decided to end her life. The tapes are passed on to her friend Clay Jensen (played by Dylan Minnette), who is tasked with sharing her story with the world.