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A **blockchain** is a secure, decentralized digital ledger that records transactions across many computers. Each **block** in the chain contains a timestamped set of transactions, and once added, these blocks are cryptographically linked, making the data immutable and auditable. This distributed network ensures transparency and security, as no single entity controls the entire system. Understanding blockchain helps clarify how cryptocurrencies like Bitcoin operate and how various industries are exploring its potential for data management and trust.