A Patronus is a magical charm in the Harry Potter series, created by author J.K. Rowling. It takes the form of an animal and serves as a protective force against dark creatures, particularly Dementors. Each person's Patronus is unique and often reflects their personality or inner strength. To conjure a Patronus, a wizard or witch must focus on a powerful, positive memory. This process requires skill and concentration, as the Patronus acts as a shield, driving away the negative energy associated with Dementors. The ability to produce a Patronus is considered a significant achievement in the wizarding world.