What is a Bitcoin Exchange?
A platform where you can buy, sell, or trade Bitcoin using traditional currency or other cryptocurrencies. Centralized exchanges (CEX) like Coinbase or Kraken hold your funds. Decentralized exchanges (DEX) let users trade directly.
Why It Matters
Exchanges are the on-ramp for Bitcoin adoption. If you want to convert dollars to bitcoin, you need an exchange. Exchanges also provide price discovery—by aggregating supply and demand from millions of users, they determine Bitcoin's market price. However, exchanges represent the biggest risk in the Bitcoin ecosystem. Major hacks have cost users billions. Exchanges are also points of control for governments—they can freeze accounts, restrict who can trade, and require identity verification. Understanding the distinction between custodial exchanges (where the exchange holds your keys) and self-custody is important. Many people use exchanges for trading but move their bitcoin to cold storage for long-term holding.
How It Works
Centralized exchanges operate like traditional brokerages. You create an account, verify your identity (KYC), and deposit money. The exchange then holds your fiat currency in bank accounts and your bitcoin in custody. When you place a buy or sell order, the exchange matches you with a counterparty and executes the trade, holding both sides' funds. Decentralized exchanges use smart contracts to let you trade directly with other users without a third party holding funds. DEXs provide more privacy and self-custody but are more complex to use and have lower liquidity than centralized exchanges.