Flash Loan
A type of DeFi loan that is borrowed and repaid within a single blockchain transaction, requiring no collateral. Often used for arbitrage opportunities.
Why It Matters
Flash loans are a unique DeFi innovation allowing users to borrow funds without collateral, provided they return them within the same transaction. This concept matters for advanced users looking to exploit opportunities quickly and efficiently.
Example
For instance, a trader might use a flash loan to buy an undervalued asset on one exchange and sell it on another for a profit, all without needing to provide upfront collateral. This highlights crypto's innovative potential.
Beginner Context
For newcomers, understanding flash loans is vital for recognizing the complexities of DeFi. They represent a cutting-edge use of blockchain technology but require advanced knowledge to navigate effectively.
Mike Starr
Founder, CryptoWizardTools · M.S. Organizational Management
Last reviewed: August 2026
Related Terms
Private Key
A secret cryptographic key that gives the holder control over a cryptocurrency wallet and the ability to sign transactions. It must be kept secure and never shared.
Block Explorer
A web-based tool that allows anyone to search and browse all transactions, wallet addresses, and blocks on a blockchain. Tools like Etherscan and Mempool.space are popular block explorers.
Multi-Signature Wallet
A crypto wallet that requires approval from multiple private keys before a transaction can be executed. For example, a 2-of-3 multi-sig wallet requires 2 out of 3 designated keyholders to approve any outgoing transaction. Often used by teams and DAOs for added security.
Market Cap
Market Capitalization. The total value of a cryptocurrency calculated by multiplying its current price by the total circulating supply.
Hard Fork
A major change to a blockchain protocol that is not backward-compatible. Nodes that do not upgrade to the new rules are rejected by the new chain, sometimes creating two separate blockchains. Bitcoin Cash was created via a hard fork of Bitcoin.