J.K. Rowling's "Harry Potter" is a series of seven fantasy novels that follow the journey of a young wizard named Harry Potter. The story begins with Harry discovering his magical heritage on his eleventh birthday and attending Hogwarts School of Witchcraft and Wizardry. Throughout the series, he faces various challenges, including the dark wizard Lord Voldemort, who seeks to conquer the wizarding world. The books explore themes of friendship, bravery, and the battle between good and evil. The series has gained immense popularity, leading to adaptations into films, stage plays, and a vast array of merchandise, making it a significant part of modern literature and culture.