The document discusses e-wallets, which allow users to store payment information like credit cards and bank accounts in a secure online environment. E-wallets can be used to send money to others via cell phone numbers and make payments without re-entering account details. Smart card technology powers e-wallets, using microprocessor chips to serve multiple applications. E-wallets offer advantages like convenience and control over payments, but also have disadvantages like potential for easy duplication and limited lifetime. The document provides an overview of e-wallets and their uses, features, payment methods, advantages, and applications.