UPI, or Unified Payments Interface, is a real-time payment system developed in India. It allows users to link multiple bank accounts to a single mobile application, enabling seamless money transfers and payments. UPI facilitates instant transactions, making it convenient for both individuals and businesses to send and receive money. The system operates 24/7 and supports various payment methods, including peer-to-peer transfers and merchant payments. Users can make transactions using their smartphones by entering a unique UPI ID or scanning a QR code. UPI has significantly transformed the digital payment landscape in India, promoting cashless transactions.