USDT (Tether) is a stablecoin, a type of cryptocurrency designed to maintain a stable value. Each USDT token is intended to be pegged 1:1 with the U.S. dollar, meaning 1 USDT ≈ 1 USD. It was launched by Tether Limited in 2014 to offer a digital alternative to fiat currency that retains price stability.

USDT is widely used for trading, transferring money across borders, and as a safe haven during crypto market volatility. It's available on multiple blockchains (like Ethereum, Tron, and Solana). While popular, Tether has faced scrutiny over its reserves and transparency.