Blockchain is a decentralized ledger used to record transactions on a computer network. It consists of a series of interconnected blocks, each containing a record of various transactions.

The main characteristic of a blockchain is that it is immutable, which means that once a block has been added to the chain, it cannot be changed. This is achieved through the use of cryptographic techniques, which allow each block to be linked to the previous one in a secure and verifiable way.

Blockchains are used in a variety of applications, including as the underlying technology for cryptocurrencies like Bitcoin. They are also used in other contexts, such as supply chain management and voting systems, where the ability to keep an accurate and immutable record of transactions is important.

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