What chains is USDT on?

Excuse me, could you please clarify which blockchain networks USDT, or Tether, is currently supported on? I understand that Tether is a stablecoin that aims to maintain a 1:1 ratio with the US dollar, but I'm interested in knowing the technical details of which blockchain platforms it utilizes for its operations. Is it only available on Ethereum, or are there other blockchains such as Bitcoin, Tron, or Algorand where USDT can be found? Your insight into this matter would be greatly appreciated.