Since the release of the first novel, Harry Potter and the Philosopher's Stone, on 26 June 1997, the books have found immense popularity, critical acclaim and commercial success worldwide. They have attracted a wide adult audience as well as younger readers and are often considered cornerstones of modern young adult literature. As of February 2018[update], the books have sold more than 500 million copies worldwide, making them the best-selling book series in history, and have been translated into eighty languages. 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.
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