Nodes are an essential component of blockchain technology, serving as the backbone of the decentralized network. In a blockchain network, nodes are devices or computers that participate in the network and maintain a copy of the blockchain ledger. Nodes validate transactions, add new blocks to the chain, and propagate the latest version of the blockchain to other nodes in the network. This helps to ensure the integrity and security of the blockchain. There are two main types of nodes in a blockchain network: full nodes and light nodes. Full nodes maintain a complete copy of the blockchain, validate transactions and blocks, and help to secure the network by participating in consensus mechanisms. Light nodes, on the other hand, do not maintain a full copy of the blockchain and rely on full nodes for information about the state of the network. In order to add new transactions to the blockchain, nodes validate the transactions and, if they are valid, include them in a new block. This block is then broadcast to other nodes in the network, who validate the block and add it to their copy of the blockchain. If a consensus is reached among the nodes in the network, the block is accepted and added to the blockchain, completing the transaction. In this way, nodes play a crucial role in maintaining the integrity and security of the blockchain. By distributing the ledger across a large number of nodes, the network becomes resistant to tampering and attacks, as any change to the blockchain would need to be made simultaneously on multiple nodes in order to be accepted. Overall, nodes are a critical part of the decentralized network that makes blockchain technology possible, and their function helps to ensure the security and stability of the network.