The format for the 'Ao Buta' anime
Anime which have episodes of or more 15 minutes in length and broadcast on television.
Anime which are under 15 minutes in length and broadcast on television.
Anime that have originally been released at theaters.
Specials that have been included in DVD/Blu-ray releases, picture dramas, pilots, etc.
OVA (Original Video Animation)
Anime that have been released directly on DVD/Blu-ray without originally going through a theatrical release or television broadcast.
ONA (Original Net Animation)
Anime that have been originally released online or are only available through streaming services.
Professionally published manga with more than one chapter.
Manga with just one chapter. This includes pilots for manga that were published fully afterward.
Doujinshi, Manhua, and Manwha are not separate formats on AniList. Instead, you have to the toggle the Self Published option for doujinshi or change the Country Of Origin for manhua and manwha.