A sequel is a follow-up to a previously released piece of media, such as a book, a movie, or a video game. It typically follows the same characters and story line, but may also introduce new characters, settings, or plotlines to keep the story moving or introduce additional conflict or excitement.
The term sequel has been used in various forms for centuries, though its use as a description for follow-up works of media only started to become popular in the early 20th century. Today, sequels are incredibly common, both in theaters and among book, video game, and television series.
When a media franchise has multiple sequels, it can also be referred to as a series. Some franchises that have particularly numerous sequels may also sometimes be referred to as sagas, trilogies, or tetralogies.
It's important to note that while the term is typically used to refer to media that follows the same characters and plotlines, sometimes there may be works that might not be considered a sequel in an absolute sense, but that still have plot points or scenes that reference or continue from its predecessor. This type of work is sometimes called a spiritual sequel.
Finally, an outright sequel isn't the only way to continue a story. Spin-offs and prequels explore different plotlines or events that occur before or after the original work, while media related to the same universe can include remakes, reboots, and transmedia.
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