|See also:||fanboy, fangirl, fanboi|
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Otaku (Japanese: おたく, house) is a negative Japanese term for obsessive fans. Otaku, in Japan, in general means a social outcast with an obsessive hobby. These hobbies aren't limited to anime and manga. These hobbies can be idol singers, AV stars, trains, swords, etc.
It started to be used internationally when anime and manga became more popular. However, in English and other languages it is used to refer to fans of manga, anime and other Japanese media, without the negative connotations it has in Japanese.