Forex ?

The foreign exchange (currency or forex or FX) market exists wherever one currency is traded for another. It is by far the largest market in the world, in terms of cash value traded, and includes trading between large banks,

central banks, currency speculators, multinational corporations, governments, and other financial markets and institutions. The trade happening in the forex markets across the globe currently exceeds $1.9 trillion/day (on average). Retail traders (individuals) are currently a very small part of this market and may only participate indirectly through brokers or banks and may be targets of forex scams.
Source:Wikipedia
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