Bitcoin is a decentralized digital currency that allows people to send and receive value directly over the internet without banks, payment processors, or any other intermediary. Unlike traditional currencies issued by governments, known as fiat money, Bitcoin is not controlled by any single entity. Instead, it runs on an open-source protocol maintained by thousands of computers worldwide.
At its core, Bitcoin uses a technology called blockchain, a distributed ledger where every transaction is permanently recorded and publicly verifiable. When you send Bitcoin to someone, that transaction is broadcast to the network, verified by miners through a process called proof of work, and then added to a block of transactions. Once confirmed, the transaction is irreversible.
Each Bitcoin is divisible into 100 million smaller units called satoshis (or “sats”), making it possible to buy and transact with very small amounts. You don’t need to buy a whole Bitcoin, most people own a fraction. As of today, 1 BTC equals approximately $77,745.34, and 1 satoshi equals approximately $0.000777.
Bitcoin’s total supply is capped at 21 million coins, a limit hardcoded into the protocol. This fixed supply is one of the key reasons Bitcoin is often compared to gold, it cannot be inflated or debased by central banks. As of today, over 20.02M BTC have already been mined, with the remaining supply released gradually through mining rewards that halve approximately every four years.