Harry Potter is a book series.
Bloomsbury Publishing plc ( formerly M.B.N. 1 Limited and Bloomsbury Publishing Company Limited ) is a British independent , worldwide publishing house of fiction and non-fiction . Harry Potter . The last four books consecutively set records as the fastest-selling books in history , with the final instalment selling roughly eleven million copies in the United States within twenty-four hours of its release . The original seven books were adapted into an eight-part film series by Warner Bros. . Scholastic Corporation is an American multinational publishing , education and media company known for publishing , selling , and distributing books and educational materials for schools , teachers , parents , and children .