Stablecoin USDT (Tether) is a type of cryptocurrency that is pegged to the value of a real-world asset, in this case the US dollar (USD). The main purpose of stablecoins is to reduce the volatility that is common with most cryptocurrencies, such as Bitcoin and Ethereum. Here are some key aspects of USDT:

Pegged to the dollar: USDT aims to maintain a 1:1 ratio with the US dollar, making it relatively stable in price.
Use: USDT is widely used for trading on cryptocurrency exchanges, moving funds between platforms, and storing value in cryptocurrency without having to go into fiat.
Blockchains: USDT exists on several blockchains, including Ethereum (as ERC-20 tokens), Tron (as TRC-20 tokens), and other platforms.
As such, USDT provides users with the benefits of cryptocurrency (fast transactions, low fees, global availability) while minimizing the risk of volatility.