The technology that facilitates blockchain's immutable record is referred to as distributed ledger technology (DLT). This framework allows data to be recorded across multiple nodes in a network, ensuring that once information is added, it cannot be altered or deleted without consensus from the majority of participants. Each block in the blockchain contains a cryptographic hash of the previous block, creating a secure link between them. This decentralized approach enhances security, increases transparency, and minimizes fraud risks, making it particularly valuable for applications such as cryptocurrency transactions and supply chain management.