“Ethereum is an open-source, public, blockchain-based distributed computing platform featuring smart contract (scripting) functionality (enables developers to build and deploy decentralized applications.) (…) It is listed under the code ETH and traded on cryptocurrency exchanges. It is also used to pay for transaction fees and computational services on the Ethereum network.” – Wikipedia

What is the difference between ETH and BTC?
On Remitano, both are crypto-currencies that can be traded at the same way. Thus there is no difference from that perspective. On a technical level, ETH and BTC have a few different points. Ethereum managed to fix disadvantages from Bitcoin such as high transaction fee and slow block confirmation. Bitcoin’s average block time is about 10 minutes, while Ethereum’s aims to be 12 seconds. 

You can follow some below references for better understanding: