HODL is a slang term for the strategy of holding cryptocurrency long-term without selling during market swings. The term has become iconic in the crypto community and describes the "buy and hold" approach.

Deflation is a sustained decline in the general level of prices in an economy over time, in which the purchasing power of the monetary unit grows. The phenomenon, the opposite of inflation, is often built into the design of cryptocurrencies.

DDoS is a distributed attack in which many devices simultaneously flood a server with requests to overload it and make it unavailable to ordinary users. It is a frequent threat to crypto exchanges and pools.

A DAO is a decentralized autonomous organization governed by rules written into smart contracts and by collective decisions of its participants, rather than by the usual board of directors and management.

A dump (Dump) is a mass sale of an asset aimed at sharply lowering its price in a short time. It is often carried out by large holders and frequently serves as part of manipulative schemes.