Blockchain is a decentralized digital ledger technology that records transactions across multiple computers in a way that ensures the security, transparency, and immutability of the data. Each transaction is grouped into a “block” and linked to the previous block, forming a “chain” of blocks. This structure makes it difficult to alter any information without altering all subsequent blocks, providing a secure and tamper-resistant record of transactions. Blockchain technology is commonly associated with cryptocurrencies but has various applications in supply chain management, finance, and digital identity verification due to its ability to provide a trustworthy and decentralized record-keeping system.