Blockchain
Definition: A digital ledger system that records transactions in a secure, transparent, and tamper-resistant way. It stores data in blocks that are linked together in a chronological chain. Once a block is filled with transaction data, it is sealed and connected to the previous block, forming a continuous record that cannot be altered without changing every subsequent block. Blockchain operates on a decentralized network of computers, each maintaining a copy of the entire ledger, which ensures transparency and reduces the risk of fraud or manipulation. It is the foundational technology behind cryptocurrencies like Bitcoin and Ethereum, but it is also used in supply chain tracking, digital identity verification, smart contracts, and other applications that benefit from secure and verifiable data sharing.