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A block is a fundamental unit of data in a blockchain, containing a collection of transactions or other information. It serves as a building block of the blockchain's distributed ledger. Each block is linked to the previous one using cryptographic hashes, forming a chain of blocks. This structure ensures the integrity and security of the data, as any modification to a block would require altering subsequent blocks as well. Blocks are added to the blockchain through a consensus mechanism, contributing to the immutability and transparency of the network's records.