USDT, or Tether, is a stablecoin, meaning it is a stable cryptocurrency aimed at maintaining a fixed value relative to the US dollar (USD). Launched in 2014 by Tether Limited, USDT is designed to offer the stability of a fiat currency while allowing for the speed and flexibility of transactions on blockchains. Each USDT is supposed to be backed by an equivalent reserve in dollars or equivalent assets, which helps maintain its parity with the dollar.