Tether (USDT) is one of the most popular stablecoins out there. It was designed to hold a one-to-one value with the US dollar. The coin exists on many different blockchains and has experienced rising trading volumes and improved liquidity over the past few years.
Like other stablecoins, USDT is useful for trading cryptocurrencies as it allows traders to avoid market volatility that is common to BTC and other crypto assets. Using stablecoins also removes the extra costs and delays of converting between crypto and fiat currencies.