Ethereum was announced at the North American Bitcoin Conference in Miami, in January 2014 and officially launched in 2015.
Ethereum is an open-source, blockchain-based, decentralized software platform used for its own cryptocurrency, ether. It is also a programming language running on a blockchain, helping developers to build and publish distributed applications.
The company is the second-largest cryptocurrency by market capitalization, behind Bitcoin. Also it is the most actively used blockchain in the world.
Ethereum enables for its users SmartContracts and Distributed Applications to be built and run without any downtime, fraud, control, or interference from a third party.
For further information, visit their official webpage.