USDT is a cryptocurrency Each USDT unit is backed by a U.S Dollar held in the reserves of the Tether Limited. its best place where you hold your crypto in case of panic selling or some other situation. it can be redeemed through the Tether Platform.
Look for BTC/USDT market to buy BTC with USDT. you can directly redeem on this website -
https://tether.to/ Guyz can I withdraw my USDT into my wallet? like some one said Tether is a altcoin so do this altcoin having a computer hardware wallet too?
yes you can look for Omni Wallet which provides service for storing USDT on online platform and offline platform such as wallet.