Gore is a sub-genre of the horror genre of anime and manga that includes more controversial series that feature more brutality, violence, and bloodshed.
The more classical horrors are often using the violence for entertainment purpose. Over the years, graphic violence started to be used more often outside pure horror genre and its entertainment purpose, and nowdays is sometimes used to showcase a darker storyline and the suffering of characters.
Characteristic for the genre is the use of graphical violence like dismembering, guts, brutal killings and larger blood splatters. The violence is sometimes against non-humans like demons or beasts, and can sometimes feature more twisted torturing or controversial premises.