In the series "Demon Slayer," demon slayers are characters who are tasked with hunting and killing demons to protect humanity. The demons, on the other hand, are malevolent beings who prey on humans and possess supernatural abilities. The demon slayers train rigorously to become skilled fighters capable of taking down these powerful demons in intense battles. The dynamic between demon slayers and demons forms the central conflict of the series, as the demon slayers strive to eradicate the demon threat and restore peace to the world.