In one sentence
Bitcoin is the world's first cryptocurrency, a form of decentralized digital money that doesn't depend on any bank or government.
Bitcoin is the world’s first cryptocurrency: a form of decentralized digital money that doesn’t depend on any bank or government to work.
It was born in 2009, created by someone (or a group) under the pseudonym Satoshi Nakamoto, as a direct response to the 2008 financial crisis. The proposal was radical for its time and still is today. It is money that no government issues, no bank holds, and no company controls, kept running by a network of thousands of computers spread around the world.
How Bitcoin works, in short
Every Bitcoin transaction is recorded on a blockchain, a public ledger that thousands of nodes keep in identical copies. Miners compete to group transactions into blocks through Proof of Work, and in exchange receive newly minted bitcoins. That process does two things at once, because it secures the network against attacks and issues the currency on a fixed schedule that no one can speed up.
The 21 million and why they matter
Bitcoin’s code establishes that only 21 million units will ever exist, issued at an ever-slower pace thanks to the halving that cuts the mining reward in half every four years. That programmed scarcity is at the heart of Bitcoin’s thesis as a store of value, and what earned it the nickname “digital gold.” While a central bank can print more bills, Bitcoin’s future supply is known decades in advance.
You don’t need to buy a whole unit. Each bitcoin is divided into 100 million satoshis, so you can start with the equivalent of a few dollars and build your position at your own pace.
