A blockchain node is a computer that participates in a blockchain network. Each node stores a copy of the entire blockchain or a portion of it, contributing to the network’s redundancy and security. Nodes validate transactions by checking them against the existing blockchain data. If the transaction meets the criteria, it gets added to the blockchain. This process helps maintain the integrity and trustworthiness of the system.There are different types of nodes. Full nodes keep a complete copy of the blockchain and validate transactions thoroughly. Lightweight nodes, on the other hand, only store part of the blockchain, relying on full nodes for verification. Running a node can involve significant resources, including storage space, processing power, and internet bandwidth. However, by participating in the network, individuals help maintain its functionality and security, often receiving rewards like cryptocurrency for their contributions. Overall, nodes are essential components that support decentralization and increase the resilience of the entire network.