Definition:
A node is a device, usually a computer (or any other electronic device), that participates in running a cryptocurrency network. They run the necessary client software and are tasked mainly with maintaining a copy of the blockchain and verifying that transactions conform to specific protocols. Nodes are integral in decentralized networks and are necessary to ensure that the system remains safe and secure.
Explanation:
Nodes are essential for a blockchain to survive. The very essence of decentralization revolves around having a global network of nodes to help run and maintain the system.
When a transaction is broadcast to the network, the relevant data is sent to a few randomly selected nodes that use the latest state of the blockchain to ensure that the transaction is valid and aligns with the rules of the blockchain.
After the nodes verify that the transaction is legitimate, miners group them into blocks to perform the calculations necessary to add them on the blockchain.
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