$USDD is a decentralized over-collateralized stablecoin, issued by over-collateralizing a basket of crypto assets (such as BTC and TRX) managed by the TRON DAO Reserve, strictly pegged to 1 US dollar. Its transparent, on-chain verifiable collateral mechanism aims to provide higher security and risk resistance than traditional algorithmic stablecoins. $USDD is deeply integrated into the DeFi ecosystem and serves as a key infrastructure for trading, lending, and cross-chain settlement, but its stability ultimately depends on the market value of the collateral and the confidence in the mechanism. Users should pay attention to its real-time collateral ratio and asset composition when using it.