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Nodes are essential components of blockchain networks, serving as the backbone of decentralized systems. Each node is a computer that participates in the blockchain network, maintaining a copy of the entire blockchain ledger and ensuring its integrity and security. Nodes validate and relay transactions, verify blocks, and uphold the consensus protocol of the network.

There are different types of nodes, such as full nodes, which store the entire blockchain and validate all transactions and blocks, and light nodes, which store only a subset of the blockchain and rely on full nodes for data verification. Full nodes enhance the security and decentralization of the network by independently verifying transactions, making it more resistant to attacks and fraud.

Nodes also play a crucial role in ensuring transparency and trust within the blockchain. By distributing copies of the ledger across multiple nodes, the network ensures that no single entity has control over the entire blockchain, preventing tampering and promoting trustless interactions. Additionally, nodes facilitate the synchronization of data across the network, ensuring that all participants have the most up-to-date and accurate information.

In summary, nodes are vital for the operation, security, and decentralization of blockchain networks, making them indispensable for the functionality and trustworthiness of decentralized systems.