A currency pair is a price quote of the exchange rate for two different currencies traded in the foreign exchange market.
Forex trading is the simultaneous buying of one currency and selling another.
When you trade in the forex market, you buy or sell in currency pairs.
Each currency in the pair is listed as a three-letter code.
The first two letters identify the name of the country and the third letter identifies the name of that country’s currency, usually the first letter of the currency’s name.
For example, USD stands for the US dollar and CAD for the Canadian dollar
In the USD/CAD pair, you are buying the U.S. dollar by selling the Canadian dollar.
The first currency listed in a currency pair is called the base currency, and the second currency is called the quote currency.
The quote currency is also known as the “counter currency”.
Currency pairs compare the value of one currency to another. It indicates how much of the quote currency is needed to purchase one unit of the base currency.
For example, for the currency “EUR/USD”, EUR is the base currency and USD is the quote currency.
If EUR/USD is trading at 1.0950, then one euro is worth 1.0950 U.S. dollars.
If the euro appreciates against the dollar, then a single euro will be worth more dollars and the pair’s price will rise.
If the euro depreciates against the dollar, the pair’s price will fall.
If you think it will weaken, you can enter a short(“sell the pair”).
You can see a long list of currencies that trade against the USD here.