päävaluuttaa
Päävaluutta, often translated as "base currency," refers to the first currency listed in a currency pair on the foreign exchange market. For example, in the EUR/USD pair, the euro (EUR) is the base currency. The value of the base currency is always expressed in terms of the quote currency, which is the second currency listed. This means that the exchange rate for EUR/USD tells you how many US dollars (USD) are needed to buy one euro (EUR).
Understanding the base currency is fundamental to interpreting exchange rates. When a currency pair is quoted,
The concept of a base currency applies universally across all currency pairs traded in the forex market.