What is the name of the tree at Hogwarts that attacks students?

The tree at Hogwarts that attacks students is the Whomping Willow. It is a magically aggressive tree whose branches lash out at anyone who comes too close. The tree was planted at Hogwarts to conceal a secret passage leading to the Shrieking Shack in Hogsmeade.

The passage was created for Remus Lupin, who used the Shrieking Shack as a secure place during his transformations into a werewolf. Lupin’s friends James Potter, Sirius Black and Peter Pettigrew secretly learned to become Animagi so they could accompany him. The tree’s dangerous reputation helped keep the route hidden.

The Whomping Willow also plays a major role in Harry Potter and the Chamber of Secrets, when Harry and Ron crash Arthur Weasley’s flying Ford Anglia into it. In Prisoner of Azkaban, it destroys Harry’s Nimbus 2000 after he falls from his broom during a Quidditch match. It is not the Forbidden Forest, Devil’s Snare or a Mandrake; those are separate magical elements.