What is the Harry Potter universe?

The Harry Potter universe is a fictional universe based on a series of books and films created by J. K. Rowling. The main characters are Harry, Hermione, Ron, and Voldemort. They live at the Hogwarts School of Witchcraft and Wizardry, where they are taught by Professor McGonagall and other teachers.

The characters must keep their secrets and keep their identities a secret from their teachers and the other students at Hogwarts. They are not allowed to talk about the magical world outside of Hogwarts, and they have to keep their magical abilities a secret.