Cryptocurrency is a form of digital money secured by cryptography, which makes it nearly impossible to counterfeit. Unlike traditional currencies issued by governments, most cryptocurrencies operate on decentralized networks built on blockchain technology — a distributed ledger enforced by a network of independent computers.
Bitcoin (BTC) is the first and most well-known cryptocurrency. It allows people to send and receive value directly, without needing a bank or other middleman. Every transaction is recorded on the Bitcoin blockchain, a public ledger maintained by thousands of computers around the world.
Bitcoin was introduced in 2008 by an anonymous person or group using the name Satoshi Nakamoto, who published a white paper titled "Bitcoin: A Peer-to-Peer Electronic Cash System." The Bitcoin network went live in January 2009 with the mining of the "genesis block."
In its early years, Bitcoin had little to no monetary value and was mainly used by hobbyists and cryptography enthusiasts. One of the most famous early transactions occurred in 2010, when a programmer paid 10,000 BTC for two pizzas — a purchase now celebrated annually as "Bitcoin Pizza Day."
Over the following decade, Bitcoin grew from an experimental idea into a globally recognized asset, attracting attention from individual investors, institutions, and even governments. Its price has been highly volatile, experiencing several dramatic booms and crashes, but it remains the largest cryptocurrency by market value.