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Every Ethereum node runs the EVM in order to maintain consensus across the blockchain. Decentralized consensus gives Ethereum extreme levels of fault tolerance, ensures zero downtime, and makes data stored on the blockchain forever unchangeable and censorship-resistant.
Account
Accounts represent identities of external agents (e.g., human personas, mining nodes or automated agents). Accounts use public key cryptography to sign transaction so that the EVM can securely validate the identity of a transaction sender.
Accounts play a central role in Ethereum: they are essential for users to interact with the Ethereum blockchain via transactions.
Account address
Account addresses are the last 20 bytes of a SHA-3 hash of a public key which is generated at account creation. This address is most often in this form : 0x0421d217d2D572244c16e6dc58E87C10d73579UF
keyfile
Wallet
To manage your Ether and Tokens comfortably, you need a special software application called Wallet. The Mist Wallet is an open source application developed by the Ethereum Foundation.
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