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Fan service (ファンサービス, fan sābisu?), sometimes written as a single word, fanservice, is a vaguely defined term chiefly used for Japanese visual media—particularly in anime fandom—to refer to elements in a story that are unnecessary to a storyline, but designed to amuse or sexually excite the audience. It is also sometimes referred to in Japan as a service cut (サービスカット, sābisu katto?) or simply service (サービス, sābisu?). The term can be applied more generally to something that is done solely to please fans.
The typically understood definition is inclusion of racy or sexual content (usually female, but also male) to titillate the viewer, such as nudity, and other forms of eye candy. Lesbian or gay activity is another form of fan service. Shower scenes are very common in movies, and in anime of the 1980s and 1990s, while many more recent TV series use trips to onsen (Japanese hot springs) or "obligatory" holiday episodes.
These latter are often to tropical locales, in order to showcase the characters in bathing suits; all aim to depict characters in states of relative undress when it would otherwise be out of place with the tone of a series. In anime, two common types of fanservice are the panty shot and jiggling breasts. Fan service permeates almost all anime, but obvious examples can be seen in the OVA series Eiken, as well as the series Tenjo Tenge.
Even popular anime such as Naruto and Bleach will occasionally contain sexual fan service. Similarly, Studio Fantasia's Agent Aika and Najica Blitz Tactics are known as the epitome of the panty-shot anime. A third type is the nude transformation sequence, first introduced in Go Nagai's Cutey Honey (1973–1974). One of the most renowned examples of fan service is the Chun-Li shower scene in Street Fighter II: The Animated Movie.