Which network works with USDT?

Could you please clarify for me which network specifically collaborates with USDT? I'm interested in understanding the technical infrastructure behind this cryptocurrency and how it interfaces with various networks. Is there a specific blockchain platform that USDT is built upon, or does it utilize multiple networks for its operations? Additionally, are there any particular advantages or disadvantages to the network USDT works with in terms of transaction speed, scalability, or security? Thank you for your assistance in clarifying this matter.