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A blockchain is a decentralized, distributed digital ledger that records transactions across many computers. It is managed autonomously using a peer-to-peer (P2P) network and requires no central authority or intermediary to process the data. Blockchains are highly secure due to its distributed, decentralized nature and cryptographic principles. They are also immutable, meaning once something is recorded on the chain it cannot be changed or removed without consensus from all participants involved in the system. This makes blockchains attractive solutions for secure data storage and sharing, identity management, supply chain tracking.