The technology underlying the creation of smart contracts in blockchain is called Ethereum. Ethereum is a decentralized platform that allows developers to write and deploy smart contracts, which are self-executing agreements with the contract terms directly written into code. These contracts run on the Ethereum Virtual Machine (EVM), ensuring they are secure and immutable once deployed. Smart contracts facilitate transactions and automate processes without intermediaries, thus promoting efficiency and trust among parties. Other platforms may also support smart contracts, but Ethereum remains the most recognized and widely used for this purpose.