Blockchain technology is transforming financial security by enabling decentralized, transparent, and tamper-proof transactions. Unlike traditional banking systems that rely on intermediaries, blockchain uses distributed ledgers to verify and record transactions securely. This reduces fraud, lowers transaction costs, and increases processing speed. Smart contracts automate agreements between parties, ensuring that transactions are executed only when predefined conditions are met. Blockchain also powers decentralized finance (DeFi), allowing users to access financial services without a central authority. As financial institutions and businesses continue to integrate blockchain into their systems, it is becoming a fundamental technology for secure and efficient financial transactions.