Tether (USDT) is a fiat‑pegged stablecoin and one of the most widely used digital assets in the cryptocurrency ecosystem. Launched in 2014 by Tether Limited, USDT is designed to maintain a 1:1 value peg to the U.S. dollar, aiming to provide a stable digital representation of fiat currency that can be used across blockchain networks for trading, payments, remittances, and DeFi applications.