In a centralized exchange, users' assets are in the hands of the exchange. Once the asset is filled, the user loses control of the asset. If the private key of the exchange is leaked or hacked, the user's assets will be lost and the security cannot be guaranteed. In a decentralized exchange, the private key of users' assets is in their own hands, and users have absolute control over their assets. Exchanges cannot touch users' assets, and hackers cannot steal them.