A blockchain is a shared digital ledger that records transactions in blocks across a network of computers.
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Short definition
Blockchain is a blockchain is a shared digital ledger that records transactions in blocks across a network of computers.
Simple explanation
A blockchain stores transaction history in a structure that many network participants can verify. Instead of one central database, the network keeps a shared record.
Why it matters
Blockchains are the foundation for crypto transactions, token transfers, smart contracts, and decentralized applications.
Example context
Ethereum, BNB Chain, Solana, Bitcoin, Polygon, Arbitrum, Base, and Tron are examples of blockchain networks.