What is a node in a blockchain network and what role does it play?

In a blockchain network, a node is a computer or a device that connects to the network and participates in the validation and confirmation of transactions. Each node has a copy of the blockchain, which is a distributed ledger that contains a record of all transactions that have occurred on the network. Nodes communicate with each other to validate new transactions and add them to the blockchain.

Nodes can be classified into different categories based on their role and function within the network. Full nodes, for example, maintain a complete copy of the blockchain and validate transactions, while light nodes only store a portion of the blockchain and rely on full nodes to validate transactions. Mining nodes are responsible for creating new blocks and are rewarded with cryptocurrency for their work.

Overall, nodes play a critical role in maintaining the integrity and security of a blockchain network by participating in the validation and confirmation of transactions.