Forex pairs are typically of three main classes:
Major Pairs are the currencies of some of the world’s most developed economies traded against the US Dollar (USD). For instance, EUR/USD, GBP/USD, USD/JPY, USDCHF, USDCAD, AUDUSD, NZDUSD
Minor Pairs and Cross Pairs, on the other hand refer to the currencies of the world’s most developed economies (excluding the US dollar) trading against each other. For instance: GBP/JPY, GBP/CHF, GBPCAD, CHFJPY, EUR/GBP, EURAUD, NZDJPY
Exotic Pairs refer to the currencies of other economies paired against a major currency or another exotic currency. For instance, USD/TRY, USD/SGD, EURNOK, USDRUB.
It is very important to be able read and understand the above currency pairs. Usually, the first quoted currency is the base currency, while the second currency is the quote currency. For example, if you bought the GBP/JPY pair, it implies that you are buying the Pounds Sterling and Selling the Japanese Yen, you stand to make a profit if the Pound strengthened against the Yen. However, you also stand to make a loss if the Pound depreciates against the Yen. The price quote is usually represented in the quote currency. For instance, if GBP/JPY is 157.74, it implies that £1 can be exchanged for 157.74 Yen.