The technology widely used for secure online voting systems is blockchain. Blockchain technology provides an immutable and transparent ledger, ensuring the integrity and security of votes cast. Each vote is recorded as a transaction on the blockchain, which is distributed across multiple nodes, making it resistant to tampering and fraud. This decentralized approach enhances trust in the voting process, as it allows stakeholders to independently verify results while maintaining voter anonymity. Additionally, smart contracts can automate aspects of the voting process, further ensuring security and efficiency.