The Ethereum blockchain stack consists of various components. At the core, there is the Ethereum blockchain running on the peer-to-peer Ethereum network. Secondly, there's an Ethereum client (usually Geth) that runs on the nodes and connects to the peer-to-peer Ethereum network from where blockchain is downloaded and stored locally. It provides various functions, such as mining and account management. The local copy of the blockchain is synchronized regularly with the network. Another component is the web3.js library that allows interaction with the geth client via the Remote Procedure Call (RPC) interface.
This architecture can be visualized in the following diagram:
The Ethereum stack showing various ...
