What are currency pairs
Forex Trading always involves selling one currency in order to buy another. For this reason, they are quoted in pairs that show which currency is being bought and which is being sold. Each currency in the pair is listed in the form of its three letter code, which tends to be formed of two letters that stand for the region, and one standing for the currency itself.
GBP/USD , for instance, is a currency pair that involves the Great British pound and the US dollar. In this pair, you are buying pound sterling by selling US dollars.
Base and quote currency
The first currency listed in a forex pair is called the base currency, and the second currency is called the quote currency. The price of a forex pair is how much one unit of the base currency is worth in the quote currency.
So in the above example, GBP is the base currency and USD is the quote currency. If GBP/USD is trading at 1.35361, then one pound is worth 1.35361 dollars.
If the pound rises against the dollar, then a single pound will be worth more dollars and the pair’s price will increase. If it drops, the pair’s price will decrease. So if you think that the base currency in a pair is likely to strengthen against the quote currency, you can buy the pair (going long). If you think it will weaken, you can sell the pair (going short).