TRON initially launched TRX as a token on the Ethereum network while the project was working on its mainnet. In 2018, following the launch of the TRON mainnet, the TRX tokens were migrated over to the TRON platform.
TRON is a somewhat controversial project in the cryptocurrency community, and one of the main reasons for this is that the TRON whitepaper allegedly contains content that was plagiarized from the Ethereum project. In terms of the TRON protocol’s code itself, the project also has many similarities to Ethereum.