It's an interactive quiz to help determine what your Patronus.
Patronus is a form of advanced magic, which even the most qualified wizards can struggle with. Harry Potter is one of the youngest wizards to cast a corporeal Patronus, having been taught by Professor Lupin at the tender age of thirteen.
As per LA Times, users are asked to make a series of rapid choices from cryptic prompts written by the author to discover which animal is their protector. During the process, they are taken through a 3-D-rendered forest until they’re finally granted an ethereal guardian of their very own.
Once users have discovered their Patronus, it is added to their official Pottermore profile, making the experience distinctly different from your average online quiz that can be manipulated for desired results.
Discover your Patronus at Pottermore.com.