"American Gods" is a fantasy novel by Neil Gaiman that explores the clash between old and new deities in America. The story follows Shadow Moon, an ex-convict who becomes embroiled in a conflict between the ancient gods, like Odin, and modern deities representing contemporary society, such as Media and Technology. As Shadow travels across the country, he encounters various mythical beings and learns about the power of belief and the changing landscape of faith. The novel delves into themes of identity, culture, and the impact of immigration, making it a rich tapestry of American mythology and modern life.