Since the Harry Potter franchise first made its debut, it's had a loyal fanbase prone to online Potterhead quizzes. One of the most popular of these is the test to reveal one's Patronus. The Patronus charm is a unique, complicated, and mysterious part of the Wizarding World, a defensive charm that conjures a magical guardian to right against the darkness of creatures such as the Dementors. A corporeal Patronus will take the form of an animal, and can even be used to relay messages to other wizards. The Patronus charm is one of the most important within the Harry Potter world due to its meaning and use, and it's only right to dive into the Patronus of one of Harry Potter's most mysterious wizards.
Source：https://www.cbr.com/snape-patronus-doe-explained-harry-potter/
