Exchange Foreign Forex

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

foreign
relating to or originating in or characteristic of another place or part of the world; "foreign nations"; "a foreign accent"; "on business in a foreign city"
Of or belonging to another district or area
of concern to or concerning the affairs of other nations (other than your own); "foreign trade"; "a foreign office"
alien: not contained in or deriving from the essential nature of something; "an economic theory alien to the spirit of capitalism"; "the mysticism so foreign to the French mind and temper"; "jealousy is foreign to her nature"
Of, from, in, or characteristic of a country or language other than one's own
Dealing with or relating to other countries

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.
Foreign exchange
The foreign exchange market (forex, FX, or currency market) is a worldwide decentralized over-the-counter financial market for the trading of currencies.
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.