Ethereum is a decentralized blockchain platform that allows developers to build and deploy decentralized applications (dApps) on its network. Its native cryptocurrency is called Ether (ETH), which is used to pay for transaction fees and for developers to build and deploy their dApps on the Ethereum network.

Ethereum differs from Bitcoin and other cryptocurrencies in several ways. Firstly, Ethereum allows for the creation of smart contracts, which are self-executing agreements between parties that are coded on the blockchain. This allows for decentralized applications to be built on top of the Ethereum network.

Additionally, Ethereum has a faster block time than Bitcoin, which allows for quicker transaction confirmations. Ethereum also has a different mining algorithm than Bitcoin, which makes it more accessible to people with consumer-grade hardware.

Overall, Ethereum is a more versatile and programmable blockchain platform than Bitcoin and many other cryptocurrencies, which has led to its widespread adoption and use in various industries.