Left: Scholastic. Right: Warner Bros.
J.K. Rowling's "Harry Potter" universe has come a long way since "Harry Potter and the Sorcerer's Stone" was released way back in 1997.
Right now, there are ten books, eight movies, and one play (also published as a book) - and it's getting even more complicated.
By the end of 2016, we'll have four new books and a movie. There's also been a steady stream of new stories coming out of Pottermore.
To help you out, here's a handy guide to all the material in the Harry Potter universe. The release years are included to give you an idea of how everything unfolded.