The "Sandman" is a popular comic book series created by Neil Gaiman. It follows the story of Dream, also known as Morpheus, who is one of the Endless, a group of powerful beings that personify universal concepts. The series explores themes of dreams, storytelling, and the nature of reality, as Dream interacts with various characters from mythology, history, and literature. Throughout the series, Dream faces challenges and consequences for his actions, leading to a rich narrative filled with imagination and depth. The "Sandman" has been praised for its intricate storytelling and beautiful artwork, making it a beloved classic in the world of graphic novels.