"The Harry Potter Series" by J.K. Rowling is a fantasy saga following Harry Potter, a young wizard, as he attends Hogwarts School of Witchcraft and Wizardry. Alongside friends Hermione Granger and Ron Weasley, Harry faces various challenges, including battling the dark wizard Voldemort. The series explores themes of friendship, bravery, and the battle between good and evil, captivating readers of all ages.