The first currency (such as BTC) is referred to as the 'base currency', while the second currency (such as USD, CNY, ETH) is referred to as the 'quoted currency' or 'relative currency'.

2. Characteristics of BTC trading pairs

High liquidity: BTC is one of the most traded currencies in the cryptocurrency market, so BTC trading pairs typically have high liquidity.

High price volatility: BTC prices are highly volatile, which makes trading BTC pairs carry high risks and potential rewards.

24-hour trading: Unlike traditional financial markets, BTC trading pairs are traded 24 hours a day without interruption, allowing traders to buy and sell at any time.