Why was International Monetary Fund (IMF) created in 1945 and what was the purpose of introducing special drawing rights (SDRs) by IMF? Why SDRs is called paper gold?

The International Monetary Fund (IMF) was created in 1945 to foster international monetary cooperation, secure financial stability, facilitate international trade, promote high employment and sustainable economic growth, and reduce poverty around the world. The IMF's primary purpose is to ensure the stability of the international monetary system - the system of exchange rates and international balance of payments that enables countries (and their citizens) to transact with one another. This system is essential for promoting sustainable economic growth, increasing living standards, and reducing poverty. The SDR was created by the IMF in 1969 to support the Bretton Woods fixed exchange rate system. A country participating in this system needed official reserves, government or central bank holdings of gold and widely accepted foreign currencies that could be used to purchase the domestic currency in foreign exchange markets, to maintain its exchange rate. But the international supply of two key reserve assets - gold and the US dollar - proved inadequate for supporting the expansion of world trade and financial development. Therefore, the international community decided to create a new international reserve asset SDR under the IMF. Originally, the value of the SDR was equivalent to 0.888671 grams of fine gold - which, at the time, was also equivalent to one US dollar. But when the dollar was devalued against gold and against other major currencies, the SDR retained its nominal gold value, hence it was referred to as "paper gold."