The currency used in Japan is the Japanese yen, abbreviated as JPY. The yen is one of the most traded currencies in the world and serves as the official currency for Japan. It is symbolized by "¥," and its value is often influenced by Japan's economic policies and global market conditions. The yen is available in both coins and banknotes, and it plays a crucial role in Japan's economy, which is one of the largest in the world. The stability and strength of the yen make it significant in international trade.