$BTC (Bitcoin) is the most popular digital currency and the first in terms of market capitalization and trading volumes in the world.

The US Dollar (USD, “Greenback”) - the most traded currency in the world, issued by the Federal Reserve System.

It is considered the most popular reserve currency held by central banks, financial institutions, and private investors.

It is often seen as a "safe haven" during times of turmoil due to the globally recognized reliability of the US economy.

It is used as a standard unit of payment for commodity markets.

The BTCUSD pair is the most traded cryptocurrency pair in the world. Bitcoin is one of the most influential cryptocurrencies, while the US Dollar is the pricing currency. This pair provides the number of dollars needed to trade BTCUSD.