What is Bitcoin?
Bitcoin is a digital currency that runs on a public, shared record called a blockchain. No bank or company controls it; instead, a worldwide network of computers keeps the record in agreement.
A plain explanation
Bitcoin is money that exists only as entries on a shared digital ledger. Instead of a bank tracking who owns what, thousands of independent computers each keep a copy of the same record and constantly check it against one another. When you 'own' Bitcoin, what you really own is the ability to authorize moving an amount recorded at your address.
Where it came from
Bitcoin was introduced in 2009 as the first widely used cryptocurrency. Its defining idea was letting people transfer value directly to each other over the internet without a trusted middleman in between, while preventing anyone from spending the same coins twice.
What makes it different from a bank balance
A bank balance is a promise from the bank. A Bitcoin balance is an entry on a public ledger that you control with a private key. That difference is the source of both Bitcoin's main advantage (no single party can freeze or reverse it) and its main responsibility (if you lose your keys, no institution can restore access).
Bitcoin is the reference point for almost everything else in this space. Understanding it makes wallets, fees, networks, and other crypto far easier to follow — and helps you read the news without getting lost in hype.
Think of a public spreadsheet that everyone can see but no one can secretly edit. Each row is a transaction. Your key lets you add a new row that moves an amount from your address to someone else's — and the whole network checks the math before accepting it.
- Bitcoin's price can move sharply and unpredictably; its value is not fixed to any currency.
- Owning Bitcoin yourself means you are responsible for your keys — there is no 'forgot password' for self-custody.
- Many scams use Bitcoin's name and reputation; the asset being real does not make every offer involving it legitimate.
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Last reviewed 2026-06-25. This topic can change over time; always confirm current specifics from primary sources.