Blockchain technology is often associated with cryptocurrencies, such as Bitcoin and Ethereum, which utilize this decentralized ledger system to enable secure, transparent transactions. Blockchain's structure—comprising a chain of blocks that store data—provides high levels of security and integrity, as each transaction is recorded and cannot be altered retroactively without consensus from the network. Beyond finance, blockchain has applications in supply chain management, healthcare, and identity verification due to its potential to enhance transparency and trust.