"Outlander" is a historical fiction series written by Diana Gabaldon. It follows the story of Claire Randall, a World War II nurse who is mysteriously transported back to 18th-century Scotland. There, she encounters the rugged Highland warrior Jamie Fraser and becomes embroiled in the Jacobite risings. The series explores themes of love, time travel, and cultural conflict. It combines elements of romance, adventure, and history, making it popular among readers. The books have also been adapted into a successful television series, further expanding its audience and impact.