Harry Potter is a heptalogy of fantasy novels written by British author J. K. Rowling. The books chronicle the adventures of the eponymous adolescent wizard Harry Potter, together with Ron Weasley and Hermione Granger, his best friends. The central story arc concerns Harry's struggle against the evil wizard Lord Voldemort, who killed Harry's parents in his quest to conquer the wizarding world, after which he seeks to subjugate the Muggle (non-magical) world to his rule.
Since the release of the first novel Harry Potter and the Philosopher's Stone in 1997, which was retitled 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 spawned films, video games and Potter-themed merchandise. As of April 2008, the seven book series has sold more than 375 million copies and have been translated into more than 64 languages. The seventh and last book in the series, Harry Potter and the Deathly Hallows, was released on 21 July 2007. Publishers announced a record-breaking 12 million copies for the first print run in the U.S. alone.