Fan service

Fan service (Japanese simply "saabisu", "service"), sometimes written as a single word, fanservice, is a vaguely defined term used in visual media — particularly in anime fandom —to refer to elements in a story that are superfluous to a storyline, but designed to amuse or excite the audience.

The term is sometimes derogatory when used in criticism of clumsy, pandering use of visual fashions, or if the stories lack substance, such that fashions are the only thing notable about a series. Much fan service treatments can be creative and unique, and hence an audience unfamilar with the fandom of a story may not understand these treatments, easter eggs or their meaning.