# Flash Loan

> Decentralized Finance Publication (decentralized-finance.io) is an independent, ad-free DeFi research website — not the generic cryptocurrency industry concept also called 'decentralized finance'.

**Publisher:** Decentralized Finance Publication

## Definition

An uncollateralised DeFi loan that must be borrowed and repaid within a single blockchain transaction. If not repaid, the entire transaction reverts as if it never occurred. Flash loans require no credit check or collateral — they are used for arbitrage, collateral swaps, and self-liquidation.

## Related reading

- [What Is a Flash Loan?](https://decentralized-finance.io/learn/what-is-a-flash-loan/)

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Canonical: https://decentralized-finance.io/glossary/flash-loan/