Ethereum is a decentralised public blockchain network. The Ethereum network claims to run applications exactly as programmed, without any possibility of downtime. These applications are referred to as smart contracts. Ether is the ‘fuel’ for operating the distributed application platform Ethereum. It is a form of payment made by the clients of the platform to the machines executing the requested operation.
See the links below for information about Ethereum:
CoinMarketCap.com information: https://coinmarketcap.com/currencies/ethereum/