A film series is a collection of movies that share a common theme, storyline, or characters. These films are often released in succession and can be sequels, prequels, or spin-offs. Popular examples include the Harry Potter series and the Star Wars saga, where each installment builds on the previous ones, expanding the story and character development. Film series can vary in length, with some consisting of just a few films, while others may have numerous entries. They often attract dedicated fan bases and can lead to merchandise, video games, and other media adaptations, further enhancing their cultural impact.