Distributed Ledger
A distributed ledger is a decentralized database that records transactions across multiple nodes or computers, ensuring data consistency and immutability without a central authority. It enables secure, transparent, and tamper-resistant record-keeping through cryptographic techniques and consensus mechanisms. This technology underpins systems like blockchain, where data is stored in a chain of blocks, but it also includes other non-blockchain implementations such as directed acyclic graphs (DAGs).
Developers should learn about distributed ledgers when building applications that require high security, transparency, and trust in data integrity, such as in finance for cryptocurrencies, supply chain tracking, voting systems, or identity management. It is essential for scenarios where eliminating single points of failure, preventing fraud, and enabling peer-to-peer transactions without intermediaries are critical, as seen in decentralized finance (DeFi) or smart contract platforms.