What network is USDT OMNI?

Could you elaborate on the network behind USDT OMNI? I've heard of USDT, but I'm not entirely sure about the OMNI variant. Is it a separate blockchain or a token issued on an existing platform? I'm particularly curious about its underlying technology, scalability, and whether it offers any specific advantages over other stablecoin solutions. Also, are there any significant risks associated with using USDT OMNI that investors should be aware of? Understanding these details would help me make a more informed decision regarding its potential use in my portfolio.