The forex market is the largest financial market in the world, trading around $1.5 trillion each day. Trading in the forex is not done at one central location but is conducted between participants through electronic communication networks (ECNs) and phone networks in various markets around the world.
The market is open 24 hours a day from 5pm EST on Sunday until 4pm EST Friday. The reason that the markets are open 24 hours a day is that currencies are in high demand. The international scope of currency trading means that there are always traders somewhere who are making and meeting demands for a particular currency.
Currency is also needed around the world for international trade, as well as by central banks and global businesses. Central banks have relied on foreign-exchange markets since 1971 - when fixed-currency markets ceased to exist because the gold standard was dropped. Since that time, most international currencies have been "floated", rather than pegged to the value of gold.
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Forex Decoder