What is a block chain?

A blockchain is a digital ledger of economic transactions that is transparent, decentralized, and secure. It is a decentralized, distributed database that is used to keep records of transactions across a network of computers. Each block in the chain contains a cryptographic hash of the previous block, timestamp, and transaction data. The decentralized nature of the blockchain allows for peer-to-peer transactions without the need for a centralized intermediary, such as a bank or government. It is used for cryptocurrency transactions, global supply chain management, decentralized voting systems, and more. The security of the blockchain is ensured through mathematical algorithms, making it difficult to hack or alter the data in the chain.