What is Exchange?
Crypto Glossary Definition
A marketplace where cryptocurrencies and other financial instruments are traded.
Why Exchange Matters
An exchange is a platform for buying, selling, and trading cryptocurrencies — centralized exchanges (CEXs) like Binance or Coinbase custody your funds and require KYC, while decentralized exchanges (DEXs) let you trade directly from your own wallet.
Exchange in Practice
A newcomer to crypto with a few hundred dollars to invest has to decide where to actually buy something. She starts with a centralized exchange, creating an account, submitting identification for KYC verification, and depositing money from her bank, all fairly similar to opening a regular brokerage account, and the exchange holds her coins in its own custody afterward. Months later, after reading about self-custody, she tries a decentralized exchange instead, connecting her own wallet directly through a browser extension and swapping tokens peer-to-peer through a smart contract, with no account creation, no ID check, and no company ever holding her funds on her behalf. The tradeoffs become obvious quickly: the centralized exchange offered customer support, fiat on-ramps, and a familiar interface, but also meant trusting a company with her assets, as history has shown can go wrong when exchanges suffer hacks or insolvency. The decentralized exchange gave her full control over her funds at all times, but also full responsibility, since there was no support line to call if she made a mistake. She ends up using both, buying on the centralized platform and moving certain funds to a DEX when she wants direct control or access to a newer token not yet listed elsewhere.
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