SDR, or Special Drawing Rights, is an international reserve asset created by the International Monetary Fund (IMF) to supplement its member countries' official reserves. It is not a currency but can be exchanged among countries for freely usable currencies, helping to stabilize economies during financial crises. The value of SDR is based on a basket of major currencies, including the U.S. dollar, euro, Chinese yuan, Japanese yen, and British pound. Each member's allocation of SDR is determined by its quota in the IMF, allowing countries to access additional liquidity when needed.