The primary currency used in Japan is the yen (JPY). The yen, introduced in 1871, is one of the most traded currencies in the world and is used in various transactions, both domestically and internationally. The symbol for the yen is "¥," and it is subdivided into 100 sen, although sen coins are no longer in use. The Bank of Japan is responsible for issuing and regulating the yen, ensuring its stability and managing monetary policy. The yen's value can fluctuate against other currencies, influenced by economic conditions, trade balances, and geopolitical factors, playing a significant role in global finance.