A spin-off series is a television show or film that is derived from an existing series, focusing on a specific character, storyline, or theme. These series often expand the original universe, allowing for deeper exploration of characters or events that may not have been fully developed in the original work. For example, the TV show Breaking Bad led to a successful spin-off called Better Call Saul, which centers on the character Saul Goodman. Spin-offs can be created for various reasons, such as to capitalize on a character's popularity or to explore new narratives within the same world. They may feature familiar characters or introduce new ones, while still maintaining connections to the original series. Successful spin-offs can attract both existing fans and new viewers, contributing to the overall franchise's popularity.