Please explain what's pottermore and why it is so famous?

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It's a new way to experience the HP saga.

So Pottermore is this site designed by JK Rowling. Basically it's like the HP world for us muggles. You explore the books, get background info on the characters, get sorted, etc.
Ok, that's kind of a crappy description, but it opens to everyone in October, check it out and see what you think.
It starts out a little slow, but it gets much more interesting, honestly.

many people say that this site was DESIGNED by J.K Rowling but she just HELPED make it. Sony and j.K Rowling and a bunch of other companies worked together to make an online reading world of harry potter. its basicly this amazing readin expirience that brings the books to life with graphical high definition design. J.K Rowling will also share secrets about Harry Pottter that she's never shared before. you can also chat and stuff like that. It keeps Harry Potter alive.

Because Harry Potter movies are instrestig to watch, the book is famous for children and J K rolling is a famous Arthour.