How do I know if my USDT is ERC-20?

I'm quite new to the world of cryptocurrencies and I've recently acquired some USDT. However, I'm not sure if it's the ERC-20 version or not. Could you please explain to me how I can determine this? I've heard that ERC-20 tokens are compatible with a wide range of wallets and exchanges, so it's important for me to know which type I have. Could you guide me through the steps to verify the type of my USDT? Also, are there any specific features or benefits that I should be aware of with ERC-20 USDT? Thank you for your help in navigating this sometimes confusing world of crypto.