Tether (USDT) is a stablecoin. The nature of a stable cryptocurrency is the fact that it is not subject to price fluctuations. Tether is based on the Yankee currency (the dollar), so the value of the Tether currency is subject to changes thereof. The change in prices is present, however the fluctuation is very slight. There are many stablecoins on the market, but this one undoubtedly beats them all.
This is due to the fact that the cryptocurrency is based on the dollar and has a large market capitalization. Most of the cryptocurrencies are based on their own chain of blocks, or on Bitcoin or Ethereum. However, Tether uses the SHA256 algorithm, which is the Bitcoin algorithm. The number of coins that can be mined is strictly related to the amount of assets deposited in the Tether account.