An Ethereum node is a computer that participates in the Ethereum network. Each node maintains a copy of the Ethereum blockchain, which is a decentralized ledger of all transactions and smart contracts.There are different types of nodes. Full nodes store the entire blockchain and verify all transactions and blocks. They help maintain the network’s security by ensuring that the rules of the blockchain are followed. Light nodes, on the other hand, only download a portion of the data and rely on full nodes for validation.In addition to holding data, nodes communicate with each other to propagate transactions and blocks throughout the network. This decentralized structure enhances security and resilience, as there is no central point of failure.Running an Ethereum node contributes to the strength of the network and can confer certain benefits, such as having greater control over transactions and access to advanced features of the Ethereum system. Overall, nodes play a crucial role in maintaining and supporting the functionality of Ethereum.