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Bitcoin is a decentralized digital currency that lets people send value directly to one another over the internet without a bank or middleman. Created in 2009, it exists purely as data recorded on a public ledger called the blockchain. No single company or government controls it; instead, a global network of computers maintains and verifies it, making Bitcoin the first widely adopted cryptocurrency.

Bitcoin runs on a blockchain, a shared public ledger duplicated across thousands of computers worldwide. When someone sends Bitcoin, the transaction is broadcast to the network, verified, and grouped with others into a block that is added to the chain. This distributed record makes past transactions extremely hard to alter, and cryptography ensures only the rightful owner can spend the coins tied to their wallet.

Mining is the process that confirms transactions and adds new blocks to the blockchain. Miners use powerful computers to compete at solving complex mathematical puzzles, and the winner earns newly created bitcoin plus transaction fees. This work, known as proof of work, secures the network and controls how new coins enter circulation. It also requires significant computing power and energy, which is a frequent point of debate.

Bitcoin’s code caps the total supply at 21 million coins, a rule built in from the start. New coins are released to miners at a rate that halves roughly every four years, an event called the halving. This designed scarcity contrasts with traditional currencies that central banks can print at will, and it is a key reason some people view Bitcoin as a potential store of value.

Bitcoin can function as money because it can store value and be used for payments, but it differs from traditional currencies. It is not issued by any government, and only some merchants accept it directly. Its price is also highly volatile, swinging sharply over short periods. Many people treat it more as a speculative asset or long-term holding than as everyday cash, though its uses continue to expand.

The Bitcoin network itself is secured by cryptography and has operated continuously since 2009, but that does not make it risk-free. Its price is highly volatile, and users are responsible for protecting their own wallets and keys. Legality varies by country, so its status depends on where you live. Anyone exploring Bitcoin should understand these risks and never commit more than they can afford to lose.