A currency pair represents the price of one currency quoted against another. For example, BTC/USD is a currency pair that defines the price of BTC in terms of USD.

In a currency pair, the first listed currency is called the base currency and the second is the quote currency. When we look at a currency pair, we can see how much of the quote currency (in our example, USD) is needed to get some unit of the base currency (in our example, BTC).

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