Which J.K. Rowling novel introduces the wizarding prison called Azkaban?

Harry Potter and the Prisoner of Azkaban introduces the wizarding prison called Azkaban.

The third Harry Potter novel was published in the United Kingdom in 1999. Its plot centers on Sirius Black, who has escaped from Azkaban and is widely believed to be pursuing Harry. The story later reveals that the public account of Black's past is incomplete.

Azkaban is guarded by Dementors, dark creatures that drain hope and happiness. Their presence gives the novel a more psychologically unsettling atmosphere than the earlier books. The prison is also important because it connects Harry's present with the lives of his parents and their school friends.

The phrase “Prisoner of Azkaban” refers to Sirius Black, not Harry. The book was adapted into the third film, released in 2004 and directed by Alfonso Cuarón. It is also the first novel in the series to feature Professor Remus Lupin as a major character.