Ethereum

Web 3.0 publishing platform. Purpose of Ethereum is to decentralise the Web. Read more on Wikipedia and Ethereum forum

Referred to as a secure decentralised generalised ledger see gavwood.com

Roughly speaking, Blockchain Technology in Ethereum is used differently from Bitcoin and serves different purposes.

Ethereum is a project aiming to decentralize the internet and return it to its democratic roots. It is a platform for building and running applications which do not need to rely on trust and cannot be controlled by any central authority - ethereum.org

Ethereum is a blockchain-based virtual machine and Web 3.0 platform featuring stateful user-created digital contracts and a Turing-complete contract programming language. Ethereum uses its underlying network unit, Ether, as payment to execute Ethereum contracts as a workaround to the halting problem. In this respect, Ethereum is unlike most cryptocurrencies, as it is not solely a network for transacting monetary value, rather, it is a network for powering Ethereum-based contracts - Wikipedia