Just like Bitcoin, Ethereum is also another cryptocurrency that is gaining popularity. Even so, it has several differences compared to Bitcoin namely:
decentralized Turing-complete virtual machine
the Ethereum Virtual Machine (EVM), which can execute scripts using an international network of public nodes
provides a cryptocurrency token called "ether", which can be transferred between accounts and used to compensate participant nodes for computations performed
With that let's open a great discussion about Ethereum here...