Forex Money Exchange

exchange
chemical process in which one atom or ion or group changes places with another
Give something and receive something of the same kind in return
a mutual expression of views (especially an unpleasant one); "they had a bitter exchange"
Give or receive one thing in place of another
give to, and receive from, one another; "Would you change places with me?"; "We have been exchanging letters for a year"

forex
The market in which participants are able to buy, sell, exchange and speculate on currencies. The forex markets is made up of banks, commercial companies, central banks, investment management firms, hedge funds, and retail forex brokers and investors.
The foreign exchange (also known as "forex" or "FX") market is the place where currencies are traded. The overall forex market is the largest, most liquid market in the world with an average traded value that exceeds $1.9 trillion per day and includes all of the currencies in the world.
The foreign exchange market (forex, FX, or currency market) is a worldwide decentralized over-the-counter financial market for the trading of currencies.
Foreign exchange

money
wealth reckoned in terms of money; "all his money is in real estate"
the official currency issued by a government or national bank; "he changed his money into francs"
the most common medium of exchange; functions as legal tender; "we tried to collect the money he owed us"
A current medium of exchange in the form of coins and banknotes; coins and banknotes collectively
Sums of money
The assets, property, and resources owned by someone or something; wealth