A spin-off, a book or television series that follows and is connected to a previously successful book, film, or television series.
I was momentarily confused when The Gentlemen, a series on Netflix, was announced. This confusion stemmed from the fact that a movie with the same name, directed by the same director, was released back in 2019. When the trailer for the series was released last year, I was surprised by how closely it resembled the 2019 movie.