A spin-off series is a television show or film that is derived from an existing work, often focusing on a specific character, theme, or storyline that was introduced in the original. These series allow creators to explore new narratives while still being connected to the original show or franchise. Spin-offs can attract both existing fans and new audiences by expanding the universe of the original work. For example, a popular character from a sitcom might get their own series, allowing viewers to see their adventures in a different context.