IDR, or Indonesian Rupiah, is the official currency of Indonesia. It is abbreviated as IDR and is often represented by the symbol "Rp." The currency is issued and regulated by Bank Indonesia, the country's central bank, and is used for all transactions within the nation. The value of the IDR can fluctuate based on various economic factors, including inflation, interest rates, and trade balances. As a developing economy, Indonesia experiences changes in the IDR's exchange rate against other currencies, which can impact both domestic and international trade.