The technology that enables decentralized applications and smart contracts is blockchain. Blockchain is a distributed ledger technology that records transactions in a secure and transparent manner across a network of computers. It eliminates the need for a central authority, thereby enhancing trust and security among users. By using smart contracts, developers can automate and enforce agreements without intermediaries. Blockchain's potential extends to various sectors, including finance, supply chain, and healthcare, revolutionizing how transactions and data management occur.