In the Harry Potter series, Diagon Alley is a secret shopping area in London, England, where witches and wizards can purchase magical items such as wands, books, potions, and other magical supplies. It is also a place for students to purchase their school supplies for Hogwarts School of Witchcraft and Wizardry. The main characters in the series, Harry Potter, Ron Weasley, and Hermione Granger, are often seen shopping for school supplies in Diagon Alley.