Glossary

Exchange

Plain-language definition Crypto glossary

Key takeaways

A crypto exchange is a marketplace where users buy, sell, and trade cryptocurrencies, either for other cryptocurrencies or for traditional money.
A centralized exchange is run by a company that holds users' funds and matches orders on an internal order book, while a decentralized exchange lets users trade directly from their own wallets through smart contracts.
Exchanges are where most price discovery and liquidity live, and their main trade-off is custody versus convenience: centralized venues are easy to use but concentrate risk, while DEXs are self-custodial but put more responsibility on the user.

Definition

A crypto exchange is a marketplace where users buy, sell and trade cryptocurrencies, either for other cryptocurrencies or for traditional money.

How it works

A centralized exchange is run by a company that holds users’ funds, matches orders on an internal order book, and handles deposits and withdrawals — convenient, but it requires trusting the operator with custody. A decentralized exchange, or DEX, instead lets users trade directly from their own wallets through smart contracts, keeping custody of their assets the whole time.

Why it matters

Exchanges are where most price discovery and liquidity live, so their depth and reliability shape the whole market. The main trade-off is custody versus convenience: centralized venues are easy to use but concentrate risk, while DEXs are self-custodial but put more responsibility on the user.

Example

Buying a coin with a debit card on a centralized platform, or swapping tokens through a liquidity pool on a DEX, are two ways to use an exchange.

FAQ

Frequently asked questions

What is the difference between a centralized and decentralized exchange?

A centralized exchange is run by a company that holds your funds and matches your trades on an internal order book, which is convenient but requires trusting the operator with custody. A decentralized exchange lets you trade directly from your own wallet through smart contracts, keeping custody of your assets the whole time.

Why do exchanges matter to the crypto market?

Exchanges are where most price discovery and liquidity happen, so their depth and reliability shape the whole market. When an exchange is deep and dependable, trading is smoother for everyone using it.

Is it safer to keep coins on an exchange?

Centralized exchanges are easy to use but concentrate risk because the operator holds your funds, whereas self-custody puts you in control but also makes you responsible for security. The right balance depends on your needs, and this is educational information rather than financial advice.