The X-Men are a fictional superhero team appearing in Marvel Comics, created by writer Stan Lee and artist Jack Kirby. They first appeared in 1963 and are known for their unique abilities, which stem from mutations in their DNA. The team is led by Professor X, who aims to promote peaceful coexistence between humans and mutants. The X-Men's stories often explore themes of prejudice, acceptance, and identity, making them relatable to many fans. Key characters include Wolverine, Cyclops, and Storm, each with their own distinct powers and backgrounds. The franchise has expanded into animated series, films, and video games, solidifying its place in popular culture.