What Is Bitcoin?
In plain English
Bitcoin (BTC) is a decentralized digital currency created in 2009 by the pseudonymous Satoshi Nakamoto. It uses a peer-to-peer network and blockchain technology to enable direct transactions without intermediaries. Bitcoin has a fixed supply cap of 21 million coins, making it deflationary by design and often compared to digital gold.
How Does Bitcoin Work?
Bitcoin operates on a public blockchain — a distributed ledger maintained by thousands of computers worldwide. When you send Bitcoin, the transaction is broadcast to the network, validated by miners who solve cryptographic puzzles, and permanently recorded on the blockchain. Each block is linked to the previous one, creating an immutable chain of transaction history that anyone can verify but no single entity controls.
Why Does Bitcoin Have Value?
Bitcoin derives value from its scarcity, decentralization, and network effects. Only 21 million BTC will ever exist, creating built-in scarcity. Its decentralized design means no government can inflate the supply. As more people, institutions, and payment processors adopt Bitcoin, its utility and liquidity increase — reinforcing demand. Many investors treat it as a hedge against inflation and currency debasement.
What Are the Risks of Investing in Bitcoin?
Bitcoin is highly volatile — price swings of 10-20% in a single week are common. Regulatory uncertainty varies by country and can affect prices. Lost private keys mean permanently lost funds with no recovery option. Additionally, Bitcoin transactions are irreversible, and the market operates 24/7 with no circuit breakers. Investors should only allocate what they can afford to lose.
Frequently asked questions
Is Bitcoin legal?
Bitcoin is legal in most countries, including the United States, Canada, and the EU. However, some nations restrict or ban its use. Tax obligations apply in most jurisdictions — you typically owe capital gains tax when selling Bitcoin at a profit.
How many Bitcoins are left to mine?
As of 2026, roughly 19.8 million of the 21 million total Bitcoin have been mined. The remaining supply is released through mining rewards that halve approximately every four years, with the last Bitcoin expected to be mined around 2140.
Can Bitcoin be converted to cash?
Yes. You can sell Bitcoin for cash on a crypto exchange, through peer-to-peer platforms, or via Bitcoin ATMs. Many exchanges offer direct bank transfers, making it straightforward to convert holdings into traditional currency.
Keep exploring
Related terms
Ethereum
Ethereum is a decentralized blockchain platform that enables smart contracts and decentralized applications (dApps), powered by its native cryptocurrency Ether (ETH).
Blockchain
A blockchain is a distributed, immutable digital ledger that records transactions across a network of computers, forming the foundation of all cryptocurrencies.
Cryptocurrency Wallet
A cryptocurrency wallet is a tool that stores your private keys and lets you send, receive, and manage your digital assets securely.
Mining (Cryptocurrency)
Crypto mining is the process of using computational power to validate blockchain transactions and earn new cryptocurrency as a reward.
Capital Gains Tax
Capital gains tax applies to profits from selling assets like stocks, real estate, or collectibles. The rate depends on how long you held the asset and your total income.