The trading of two cryptocurrencies against each other on exchanges is called a trading pair. This resembles a kind of currency exchange logic. For example:
BTC/USDC — This means you can buy and sell Bitcoin with USDC.
ETH/USDC — Trading between Ethereum and USDC is possible.
Here, the first currency (for example, BTC) is the one being bought/sold, and the second currency (for example, USDC) is the currency in which the price is expressed.
