Dividends are a part of profit distributed among the holders of an asset. In a broad sense, the ROI indicator reflects the return on investment and the yield on invested capital.

A derivative is a derivative financial instrument whose value depends on the price of an underlying asset. In the crypto market, derivatives are used to hedge risks and to speculate on changes in coin prices.

A dev is a colloquial name for a developer, that is, a specialist who creates and maintains the code of cryptocurrencies, blockchain protocols, wallets, and related applications. The development of a project largely depends on devs.

A DApp is an application whose backend logic runs on a blockchain through smart contracts, without a single central server or controlling owner. The code is open and operates according to predefined rules.

Double spending is an attempt to spend the same coins twice. This is a key problem of digital money, which the blockchain solves using a distributed ledger and transaction confirmations.