A series of many genres, including fantasy, drama, coming of age and the British school story (which includes elements of mystery, thriller, adventure, horror andromance), it has many cultural meanings and references. According to Rowling, the main theme is death. There are also many other themes in the series, such as prejudice, corruption, and madness.
The series was originally published in English by two major publishers, Bloomsbury in the United Kingdom and Scholastic Press in the United States. The play Harry Potter and the Cursed Child will open in London on 30 July 2016 at the Palace Theatre and its script will be published by Little, Brown in the United Kingdom on 31 July 2016, who also published Rowling's adult novels and those written under her pen name Robert Galbraith. The seven books were adapted into an eight-part film series by Warner Bros. Pictures, which is the second highest-grossing film series of all time as of August 2015. The series also originated much tie-in merchandise, making the Harry Potter brand worth in excess of $15 billion.
Because of the success of the books and films, Harry Potter-themed areas, known as The Wizarding World of Harry Potter, have been created at several Universal Parks & Resorts theme parks around the world. The franchise continues to expand, with numerous supplemental books to accompany the films and the original novels, a studio tour in London that opened in 2012, a travelling exhibition that premiered in Chicago in 2009, a digital platform entitled Pottermore, on which J.K. Rowling updates the series with new information and insight, a sequel in the form of a stage play, and a trilogy of spin-off films premiering in November 2016, amongst many other developments.