Node

A node is a computer that participates in a blockchain network by storing a copy of the blockchain and validating transactions.

Simple Explanation

Think of nodes as bookkeepers in a decentralized accounting system. Each node keeps a complete copy of all transactions and helps verify new ones. Having thousands of nodes makes the blockchain secure and decentralized.

Types of Nodes

Full Node

• Stores complete blockchain history
• Validates all transactions and blocks
• Most secure but requires storage

Light Node

• Stores only essential data
• Relies on full nodes for verification
• Good for mobile devices

Mining/Validator Node

• Creates new blocks
• Earns rewards
• Requires significant resources

Why Nodes Matter

More nodes = more decentralized = more secure and harder to attack or control.