The document summarizes key aspects of foreign exchange markets. It discusses that the forex market is a decentralized global market for trading currencies that operates 24 hours a day. The largest forex markets are located in London, New York, Tokyo, Zurich, and Frankfurt. It also notes that India's foreign exchange reserves reached $360 billion in March 2016. The reserves help with monetary policy, exchange rates, providing liquidity and buffer against external factors, and earning subsidiary revenue. The document outlines the different types of forex markets including merchant, inter-bank, and international markets and lists some common participants. It also describes exchange rate mechanisms and derivatives used to manage foreign exchange risk.