Hentai (変態 or へんたい) English /ˈhɛntaɪ/ (lit. “pervert”) is a word of Japanese origin which is short for (変態性欲, hentai seiyoku); a perverse sexual desire.
In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work.
Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography.