A payment app is a mobile application that allows users to send and receive money electronically. These apps often link to a user's bank account or credit card, enabling quick transactions for various purposes, such as paying bills, splitting expenses, or making purchases. Popular examples include Venmo, PayPal, and Cash App. Many payment apps also offer features like transaction history, security measures, and the ability to request money from others. They are designed to simplify financial transactions, making it easier for individuals and businesses to manage their money without the need for cash or checks.