Pern is a fictional planet created by author Anne McCaffrey in her popular science fiction series, known as the Dragonriders of Pern. The planet features a unique ecosystem where inhabitants, including humans and dragons, coexist. The story revolves around the struggle against a deadly spore called Thread, which falls from the sky and threatens life on Pern. The inhabitants of Pern have developed a symbiotic relationship with dragons, which can be ridden by selected individuals known as dragonriders. These dragons can breathe fire to destroy Thread before it reaches the ground. The series combines elements of fantasy and science fiction, exploring themes of survival, community, and the bond between humans and dragons.