Don't rush to memorize the definition: why don't flash loans require collateral?
Uniswap V2's flash swaps also let you take tokens first, as long as you repay the equivalent amount before the same transaction ends, or return the tokens along with a fee.
Using flash loans requires writing a contract or relying on specialized tools. Be especially wary of bots claiming to offer one-click flash-loan arbitrage.
The lending protocol Aave, corresponding to $AAVE , offers flash loans. Currently 124.14.
#AAVE