#BTC

It seems like you're asking for a brief 100-word explanation about a "coin pair" involving Bitcoin (BTC). Here's a short description:

A coin pair, such as BTC/ETH or BTC/USD, refers to the trading relationship between two cryptocurrencies or between a cryptocurrency and a fiat currency. In this pair, Bitcoin (BTC) is typically the base currency, and the other asset (e.g., Ethereum or US dollars) is the quote currency. The price of the pair shows how much of the quote currency is needed to buy one unit of the base currency. Traders use coin pairs to speculate on price fluctuations, exchanging one currency for another to make a profit or hedge against risks.