Underneath "What is tron trc20 network?" sits one idea: the coin is the same, the road it takes is not. USDT TRC20 is the version of USDT issued as a TRC20 token on the TRON blockchain, and it is one of the most common ways to send USDT because fees there are usually low. The same coin also exists as BEP20 on BSC and as ERC20 on Ethereum. Each version has its own fees and rules, and a balance on one network never moves to another on its own.
TRC20 vs BEP20 is mostly a question of chain and fee coin. TRC20 runs on TRON and pays its fees in TRX or through energy and bandwidth; BEP20 runs on BSC and pays them in BNB. Both are usually cheaper than Ethereum. Which is cheaper at a given moment depends on network load, the resources an account holds and the withdrawal charge an exchange adds. TRON addresses begin with T and BEP20 ones with 0x, yet the network should still be picked from the list at both ends.
What is the ERC20 network? ERC20 is the token standard on Ethereum, and the ERC20 network is the everyday shorthand for sending such tokens on Ethereum. USDT ERC20 is the version of the coin issued under it, and many exchanges support it. Its fees are paid in ETH as gas: the gas a transfer uses multiplied by the gas price at that moment, which can climb sharply when Ethereum is busy. A wallet the owner controls usually needs some ETH to send ERC20 tokens at all, unless a service sponsors the fee or another party pays it.
Its network list for sending and receiving should name TRC20 or TRON explicitly; supporting USDT alone says nothing about the network.
A TRON address usually starts with the capital letter T, unlike the 0x addresses of Ethereum and compatible chains.
In energy and bandwidth, from resources the account holds or has been delegated; when those run short, the network burns TRX to cover the difference.
A small first transfer costs one extra fee but shows that the network matches before the full sum moves.
Ethereum and compatible chains share the same address format, so one 0x address can exist on both while the balances on each stay separate.