What was Hermione secret in Harry Potter and the Chamber of Secrets?

In "Harry Potter and the Chamber of Secrets," Hermione Granger's secret is that she is a Muggle-born witch, meaning she was born to non-magical parents. In the wizarding world of Harry Potter, Muggle-borns are sometimes viewed with prejudice by pure-blood wizards and witches, who believe that only those with magical heritage should be allowed to practice magic. Hermione's intelligence and skill as a witch set her apart from many of her pure-blood peers, and she becomes a target of discrimination from some students, such as Draco Malfoy and his cronies. Hermione's secret is eventually revealed during a tense moment when Draco insults her parentage, leading to a heated confrontation between the two. Despite the challenges she faces as a Muggle-born, Hermione remains a loyal and valuable friend to Harry and Ron throughout the series.