The Twilight Saga by Stephanie Meyer. When seventeen-year-old Bella leaves Phoenix to live with her father in Forks, Washington, she meets an exquisitely handsome boy at school for whom she feels an overwhelming attraction and who she comes to realize is not wholly human.
Harry Potter is one of my favorite movies. I think it's so popular because it's beyond of people's regular imagination. The concept of the movie is new and fresh to people so many get curious about it and want to watch it more.