Kakao Pay is a digital payment service in South Korea that allows users to make transactions easily using their smartphones. It is part of the Kakao ecosystem, which includes various services like messaging and social media. Users can link their bank accounts or credit cards to the app, enabling them to pay for goods and services online or in stores. In addition to payments, Kakao Pay offers features like money transfers, bill payments, and even investment options. The service aims to provide a convenient and secure way for users to manage their finances and make everyday transactions without cash.