Bitcoin $BTC is the first and most popular decentralized digital currency, invented in 2009 by an unknown person or group using the name Satoshi Nakamoto. It allows peer-to-peer transactions without the need for a central authority like a bank. Bitcoin operates on blockchain technology, which ensures transparency and security. Its supply is limited, with only 21 million coins that will exist, making it deflationary by nature. BTC is often used as a store of value and is referred to as "digital gold." Its price is volatile, influenced by demand, regulation, and market sentiment. Bitcoin continues to transform the financial world.