Shinto (Japanese: 神道) is a form of Japanese animism. It has many kami, translated as gods or nature spirits. Some "kami" are just spirits of certain places, and some are the overall "kami" (like "Amaterasu", the Sun goddess). The word "Shinto" comes from the Japanese words "神", shin—the word for spirit, and "道", tō—the word for "the way" or "path". So, Shinto means "the way of the gods."
State Shinto was the main religion of Japan before World War II. During the period 1868 to 1945 the Japanese government used Shinto for propaganda. All Japanese were forced to register with their local shrine. All Shinto priests worked for the government. War was seen as a sacred duty. The Emperor of Japan was seen as a god. Japanese Buddhism was also involved with the war effort (See Zen at War).