A coin pair like \$BTC refers to trading Bitcoin against another cryptocurrency or fiat currency on an exchange. For example, BTC/USDT means you're trading Bitcoin against Tether. Coin pairs help determine the value of one asset relative to another. Traders use these pairs to capitalize on price movements and arbitrage opportunities. Understanding liquidity, trading volume, and spread in a coin pair is vital for effective trading. Bitcoin pairs are among the most traded, offering deep liquidity and tighter spreads. Choosing the right BTC pair depends on your strategy, risk tolerance, and market conditions.