J.K. Rowling’s website launched in 2011 for the expanded Harry Potter universe was Pottermore.
Pottermore was announced in June 2011 and opened to the public in April 2012 after an invitation-based period. It combined interactive features with new writing by Rowling, including background information about characters, places, and wizarding traditions that were not fully explained in the seven novels.
The website initially included a digital Sorting Hat experience, a wand-selection sequence, and interactive moments based on the books. It also became a retailer for Harry Potter e-books and digital audiobooks. Its content gave readers additional context while remaining separate from the original printed novels.
In 2019, the site was relaunched as WizardingWorld.com, using the name associated with the broader franchise. Because of that change, people sometimes use Pottermore and Wizarding World interchangeably, but Pottermore is the earlier website and brand. The later site expanded beyond Rowling’s original online platform.