Anime types represent the medium for which an anime was first released.
NEEDS THE IMAGES THAT ARE USED TO DISPLAY TYPES (e.g. in mylist)
Anime that is first released as a movie in theatres.
Original Video Animations are animated films and series made specially for release in home-video formats (e.g. VHS, DVD, BluRay).
Anime that is first released as a series on TV.
Anime that is first released as a one-off, (generally) non-recurring episode/movie on TV. A TV special can have multiple episodes.
A notable differentiation from a normal TV series is that TV specials generally are not serialized. Further, if Japan/China/Korea specifies that it is a TV special, it is probably a TV special.
Anime that is first released as streaming media.
Anime that is a music video.
Anime that doesn't fall into any other category.
Anime that has no type set yet. Generally for anime that hasn't been released yet.