$BTC The most popular and widely traded cryptocurrency pair is BTC/USD, also known as Bitcoin/US Dollar. This pair represents the value of one Bitcoin in terms of the US Dollar. Traders and investors use this pair to buy or sell Bitcoins, hoping to profit from fluctuations in its value. As the most liquid cryptocurrency, Bitcoin's price movements have a significant impact on the entire cryptocurrency market. The BTC/USD pair is available on most cryptocurrency exchanges, and its volatility makes it attractive to traders who seek to capitalize on short-term price movements.