Defence Against the Dark Arts, also known as D.A.D.A, is a class taught at Hogwarts School of Witchcraft and Wizardry that focuses on defensive techniques to block spells, charms, curses, hexes and jinxes cast by other wizards, counteract the Dark Arts, and to protect from dark magical beasts and creatures such as the Boggart. Defence Against the Dark Arts is taught to Hogwarts students from the first year to the fifth, with the option of N.E.W.T. classes in the sixth and seventh years for students who qualify.

Students who suffer mishaps during the school year are sent or brought to the hospital wing for treatment. The hospital wing is well equipped to deal with all manner of magical and mundane injuries, from broken limbs to regrowing lost bones. Only in the most severe cases are students sent to St. Mungo's Hospital for Magical Maladies and Injuries for further treatment.

The corridor that was off limits in the year 1991, nearly thirty years ago in Harry Potter's reign.

Here you will find housing awards, trophies, cups, plates, shields, statues, and medals, which are kept in a crystal glass display. This room also contains a list of Head Boys and Head Girls.