TRC-20 is the token standard of Tron: the EVM-style interface (Tron's virtual machine is a sibling) applied to a chain chosen for cheap, fast transfers. Its claim to fame is USDT-on-Tron, for years the busiest dollar rail on any blockchain.
For payments the pitch is cost: transfers settle in seconds for fees measured in cents, which is why dollar flows that used to ride correspondent banks ride TRC-20 instead.
Tron is a first-class network on U.CASH: TRC-20 tokens settle to checkouts and swaps non-custodially, with Tether-on-Tron one of the deepest pairs on the network.
Every term behind the rails, the assets, and the settlement.