Fan service
Fan service (ファンサービス, fan sābisu), fanservice or service cut (サービスカット, sābisu katto) is material in a work of fiction or in a fictional series that is intentionally added to please the audience. Classically sexual in nature, fan service may depict fictional characters in revealing outfits, poses, or situations, occasionally involving partial or full nudity. The term originated in Japanese in the anime and manga fandom.
Today, especially outside anime and manga, the term has expanded to hold a wider meaning. This includes any elements, be it visual nods, referencing older or forgotten media related to material, shipping certain characters, plot detours or otherwise, that are not needed by the actual plot or character development, but are included as nods to, or pandering to the long-term fans of the material, especially in context of sequels or prequels, or later seasons of series.