Harry Potter is a series of seven fantasy novels written by the British author J. K. Rowling. The books chronicle the adventures of the adolescent wizard Harry Potter and his best friends Ron Weasley and Hermione Granger, all of whom are students at Hogwarts School of Witchcraft and Wizardry. The main story arc concerns Harry's quest to overcome the evil dark wizard Lord Voldemort, whose aim is to conquer the wizarding world and subjugate non-magical people, and who seeks to destroy all those who stand in his way, especially Harry himself.
Since the 30 June 1997 release of the first novel Harry Potter and the Philosopher's Stone (re-titled Harry Potter and the Sorcerer's Stone in the United States), the books have gained immense popularity, critical acclaim and commercial success worldwide. The series has also had some share of criticism, including concern for the increasingly dark tone. As of June 2011, the book series has sold about 450 million copies and has been translated into 67 languages, and the last four books consecutively set records as the fastest-selling books in history.
A series of many genres, including fantasy and coming of age (with elements of mystery, thriller, and romance), it has many cultural meanings and references. According to Rowling, the main theme is death, although it is primarily considered to be a work of children's literature. There are also many other themes in the series, such as love and prejudice.
English-language versions of the books are published by Bloomsbury in the United Kingdom, Scholastic Press in the United States, Allen & Unwin in Australia, and Raincoast Books in Canada. By 2010, the first six books had been made into films by Warner Bros. Pictures; it is the highest grossing film series of all time. The seventh book was split into two films: Part 1 was released on 19 November 2010 and the series finale on 15 July 2011. The series also originated much tie-in merchandise, making the Harry Potter brand worth in excess of $15 billion.