Bitcoin is a worldwide cryptocurrency and digital payment system called the first decentralized digital currency, as the system works without a central repository. The system is peer-to-peer, and transactions take place between users directly, without an intermediary. These transactions are verified by network nodes and recorded in a public distributed ledger called a blockchain. Bitcoins are created as a reward for a process known as mining.
Mining is a record-keeping service done through the use of computer processing power. Miners keep the blockchain complete and unalterable by repeatedly verifying newly broadcast transactions into a new group of transactions called a block.