Tether (USDT) is a stablecoin, a digital currency that is pegged to the value of US dollar. It is issued by a centralized company called Tether and is used to minimize volatility in an investor's portfolio. It is also widely accepted as a payment method and is supported on multiple blockchains. USDT is often used in conjunction with cryptocurrency debit cards and is popular in the decentralized finance (DeFi) space for lending and borrowing. It is the third-largest cryptocurrency by market capitalization and is backed by reserves in cash and cash equivalents, allowing token holders to redeem their USDT for USD. Tether has also issued other stablecoins pegged to the value of other fiat currencies and commodities, such as the Chinese Yuan, the Euro, and gold.