Ethereum is a decentralized, open-source blockchain platform that enables the creation of smart contracts and decentralized applications (dApps). It was developed by Vitalik Buterin in 2013 and was officially launched in 2015.

Ethereum is different from other blockchain platforms in that it is designed to be programmable, allowing developers to build and deploy a wide range of applications on the Ethereum network. These applications are often referred to as dApps, and they can be used for a variety of purposes, including financial transactions, supply chain management, and voting systems.

Ethereum uses a cryptocurrency called Ether (ETH) to facilitate transactions on its network. Ether is used as a form of payment for the processing power required to run dApps and smart contracts, and it can also be bought and sold on cryptocurrency exchanges.

Ethereum has gained widespread adoption and is considered to be one of the leading blockchain platforms in the world. It has a large developer community and a number of high-profile dApps and projects have been built on the Ethereum platform.