$BTC we're talking about Bitcoin, the original and most prominent cryptocurrency. Here's a 100-word overview:

"In crypto trading, '$BTC' signifies Bitcoin, often paired with other currencies. '$BTC/USD' is the most common, reflecting Bitcoin's value in US dollars. However, '$BTC' also trades against other cryptos like '$ETH' (Ethereum) in '$BTC/ETH' pairs. These pairs show the relative value of each cryptocurrency. Traders use these pairs to speculate on market fluctuations, trying to profit from price differences. Bitcoin's dominance means '$BTC' pairs are crucial for understanding the overall crypto market. Monitoring these pairs helps traders gauge market sentiment and make informed decisions. #Bitcoin #Crypto #BTC #Trading"