A blockchain is a decentralized digital ledger that records transactions in a secure, transparent, and immutable way. It is essentially a database that is distributed across a network of computers, and each computer on the network holds a copy of the entire database.
The blockchain works by creating blocks of data that contain a batch of transactions, which are then added to the chain of previous blocks. Each block contains a unique code, called a cryptographic hash, that is created using the data in the block, and this hash is used to link the block to the previous block in the chain.
Once a block is added to the chain, it cannot be altered or deleted, which means that the blockchain provides a tamper-proof and auditable record of all the transactions that have ever occurred on the network. This makes blockchain technology useful for a wide range of applications, including digital currencies, supply chain management, and identity verification, among others.
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