Trading pairs are fundamental to how exchanges work. Visit the Binance Official website or Binance Official APP. iPhone users can check the iOS Installation Guide.
A trading pair like BTC/USDT means you're trading Bitcoin using USDT. The first coin (BTC) is what you're buying/selling; the second (USDT) is what you're paying with. Most beginners should use /USDT pairs since USDT is the most common quote currency and easiest to understand. Other quote currencies include BTC, ETH, BNB, and FDUSD. When choosing a pair, prefer USDT pairs for maximum liquidity and simplest calculation.
Q: What's the difference between ETH/USDT and ETH/BTC?
A: ETH/USDT means you pay for Ethereum with USDT (stablecoin). ETH/BTC means you pay with Bitcoin. The same ETH, different payment methods. Most users should stick with /USDT pairs.