Plain English
A trading pair is the two assets quoted against each other on an exchange — BTC/USD, ETH/BTC, SOL/USDC. The first is what you are buying or selling; the second is what you are pricing it in. “ETH/USDC at 4,200” means one ETH costs 4,200 USDC.
How it actually works
Every market has a base (left) and a quote (right). The same coin can have many pairs: ETH/USD, ETH/USDT, ETH/USDC, ETH/BTC, ETH/EUR. Liquidity is rarely equal across them — usually one or two pairs concentrate most volume, and the rest are thinner.
What it means for you
Pick the pair, not just the coin. Buying ETH on ETH/USDC at a major DEX is usually cheaper than ETH/USDT at a smaller venue because of routing and liquidity. For tax purposes, every crypto-to-crypto pair is a taxable event in most jurisdictions, including the US — so a swap from ETH to BTC is treated as a sale of ETH at the moment of the trade.
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Educational content only. Not investment, tax, or legal advice.