The majority of digital currencies, including popular options like Bitcoin, are underpinned by blockchain technology. This decentralized ledger system allows for secure, transparent, and tamper-proof transaction records. Each transaction is grouped into blocks, which are then cryptographically linked to form a continuous chain. Blockchain eliminates the need for intermediaries, reducing transaction costs and increasing trust among participants. The promise of blockchain extends beyond currencies into various sectors, including finance, supply chain, and healthcare, providing innovative solutions for secure and efficient operations.