Node:
A node is any computer or device that participates in the blockchain network. It stores the blockchain's full or partial history, validates transactions, and helps relay information across the network. There are different types of nodes, such as:
Full Node: Stores the entire blockchain and validates all transactions and blocks.
Light Node: Stores only a subset of the blockchain data, relying on full nodes for transaction validation.
Miner Node: Performs the mining process, creating new blocks (specific to Proof-of-Work blockchains).
Essentially, nodes form the backbone of a blockchain by ensuring the network operates in a decentralized manner.
Testnet:
A testnet is a blockchain network used for testing purposes. It mimics the main network (mainnet) but operates with tokens that have no real-world value. Developers and users can use the testnet to test smart contracts, dApps (decentralized applications), and other blockchain functionality without risking real assets.
Testnets allow developers to ensure everything works as expected before deploying their projects on the mainnet.
Node refers to any computer participating in the blockchain network, whereas testnet is a separate blockchain used for testing purposes.
Nodes can exist on both the mainnet and testnet, depending on whether the blockchain is in production or testing.
Testnet helps in development and testing without the risk of losing real assets, while nodes are essential for maintaining the blockchain's integrity and functionality.
