Of OVA (Jap オ ー ブ イ エ ー o:buye:) or the OAV (sometimes OBA) - acronym for Original Video Animation (Jap オ リ ジ ナ ル · ビ デ オ · ア ニ メ ー シ ョ ン oridzinaru bidet anime: son), in Japan as indicated by a special format anime -Series. Unlike anime intended for broadcast on television, and full-length anime films shown in cinemas, OVA for duration and number of series are designed for a DVD video disc. Currently, the standard duration of one series of OVA - 23-25 minutes, almost like a television. Usually OVA includes 1-6, rarely more series, with a sufficiently high quality of drawing and animation, which is close to the quality of full-length anime.
The abbreviation OAV can be deciphered as Only Adult Video - "adult video", the English term for erotic and pornographic videos.
The abbreviation OAD (Original Animation DVD) denotes an anime series released on DVDs.