Ethereum is a decentralized, open-source blockchain platform that enables developers to build and deploy smart contracts and decentralized applications. Launched in 2015 by a team led by Vitalik Buterin, Ethereum has become one of the most prominent blockchain networks in the cryptocurrency space. Here are some key aspects of Ethereum:
1. Contracts
- Smart contracts are self-executing contracts with the terms of the agreement directly written into lines of code. They automatically execute and enforce actions when predetermined conditions are met, eliminating the need for intermediaries.
2.Decentralized Applications 
- Developers can create dApps on the Ethereum platform, which run on the Ethereum Virtual Machine. These applications can range from finance  to gaming and supply chain management.
3.Ether
- Ether is the native cryptocurrency of the Ethereum network. It is used to pay for transactions and computational services on the platform. Users need Ether to execute smart contracts or perform transactions.