After several fluctuations in earlier years, the price of Tether or USDT since 2020 achieved the stability against the U.S. dollar that it was designed to reach. In 2021, Tether ranks as one of the biggest cryptocurrencies in the world and is regarded as the most well-known "stablecoin", or cryptocurrency that is connected to the price development of another, real-world asset. As Tether's USDT code suggest, the token is, in this case, connected to the U.S. dollar. This effectively means that a single Tether will nearly always be worth one single U.S. dollar. This relative stability, unlike the price development of, say, Ripple (XRP), is what defines a stablecoin and is especially important for decentralized lending and borrowing. This particular segment made up roughly half of the overall value locked in Decentralized Finance or DeFi.