What is BTG USDT?

Could you please clarify for me what BTG USDT actually represents? I've heard of cryptocurrencies but I'm not entirely sure what this particular pairing means. Is BTG a specific type of cryptocurrency and what role does USDT play in this context? Is it a trading pair, or does it have a different function? Could you also explain any potential benefits or risks associated with investing in BTG USDT? I'm quite interested in learning more about it.