Trading pairs in cryptocurrencies or financial markets refer to two pairs of assets that can be traded against each other. In the context of cryptocurrencies, one asset is usually a cryptocurrency (such as Bitcoin or Ethereum) and the other can be another cryptocurrency or a traditional currency (such as the US dollar, USD).

For example:

‱ BTC/USDT pair means you are trading Bitcoin (BTC) and Tether (USDT), which means buying or selling Bitcoin for Tether.

‱ ETH/BTC pair means you are trading Ethereum (ETH) for Bitcoin (BTC).

Simply put, trading pairs show the relationship between two currencies, where you are selling one to buy the other and vice versa.