The currency of Indonesia is the Indonesian rupiah (IDR). The rupiah is further subdivided into 100 sen, although sen coins are not commonly used in everyday transactions. The Indonesian rupiah has undergone several changes throughout its history, particularly during economic crises, when its value fluctuated significantly. Today, the currency is represented by several banknotes and coins in various denominations, and it plays a vital role in facilitating trade and economic transactions within the country and beyond.