Blockchain is a digital ledger technology that securely records transactions across a decentralized network of computers. Instead of being stored in a single location, data is kept in “blocks” that are linked together in chronological order, forming a “chain.” Each block contains transaction details, a unique code (hash), and a reference to the previous block, making the system highly secure and resistant to tampering. Because of its transparency, immutability, and trustless nature, blockchain is widely used in cryptocurrencies like Bitcoin, as well as in supply chain management, banking, healthcare, and many other industries to ensure secure, transparent, and verifiable data exchange.
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