Underneath "What is usdt trc20?" 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 by itself.
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 crowded. 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.
What is the TRON TRC20 network? TRON is a blockchain with its own coin, TRX, and TRC20 is the token standard under which other coins, USDT included, are issued on it. TRX and TRC20 are different things: one is the native coin, the other is a format. TRON counts fees in resources called energy and bandwidth. An account uses the resources it holds or has been delegated, and when they run short the network burns TRX to cover the gap, so one transfer can cost different amounts from different accounts. TRON addresses usually start with the letter T.
A small first transfer costs one extra fee but shows that the network matches before the full sum moves.
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.
BNB, the native coin of the chain, so a wallet sending BEP20 tokens needs a little BNB.
A TRON address usually starts with the capital letter T, unlike the 0x addresses of Ethereum and compatible chains.
Some platforms accept a network for deposits but not for withdrawals, or the other way round, so each page lists its own networks.