$BTC refers to trading pairs where Bitcoin (BTC) is used to exchange with other cryptocurrencies. For example, ETH/BTC means you’re trading Ethereum against Bitcoin. This pair helps traders assess the relative value of altcoins compared to Bitcoin. BTC pairs are popular on major crypto exchanges due to Bitcoin's dominance and liquidity. Traders often prefer BTC pairs to diversify portfolios or hedge against market volatility. Monitoring BTC pair trends can reveal market sentiment and capital flow. Understanding BTC pairs is crucial for technical analysis, price action, and informed crypto trading strategies in an ever-evolving digital market.