Bitcoin (BTC) is the first and most well-known cryptocurrency, introduced in 2009 by an anonymous individual or group using the name Satoshi Nakamoto. It operates on a decentralized network using blockchain technology, which is a public ledger that records all transactions. Unlike traditional currencies issued by central banks, Bitcoin is not controlled by any single authority, making it immune to government interference or manipulation. It has a fixed supply of 21 million coins, which helps protect it against inflation.

Bitcoin is mined using powerful computers that solve complex mathematical problems, validating transactions and securing the network. It has become popular as both a digital currency and a store of value, often referred to as "digital gold." Over the years, Bitcoin has gained significant attention from investors, financial institutions, and governments. Despite its volatility, it remains the most valuable and widely accepted cryptocurrency, often influencing the entire crypto market's trends and developments.