Unified Payments Interface (UPI)

Unified Payments Interface (UPI) is an instant real-time payment system developed by National Payments Corporation of India facilitating inter-bank transactions. The interface is regulated by the Reserve Bank of India and works by instantly transferring funds between two bank accounts on a mobile platform.

UPI is built over Immediate Payment Service (IMPS) for transferring funds. Being a digital payment system it is available 24x7 and across public holidays. Unlike traditional mobile wallets, which takes a specified amount of money from user and stores it in its own accounts, UPI withdraws and deposits funds directly from the bank account whenever a transaction is requested. It uses Virtual Payment Address (a unique ID provided by the bank), Account Number with IFSC Code, Mobile Number with MMID (Mobile Money Identifier), Aadhaar Number, or a one-time use Virtual ID. A UPI-PIN (UPI Personal Identification number that one creates on the UPI app of the bank) is required to confirm each payment.

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Source: Wikipedia