The Citibank Mobile App is a digital banking platform that allows users to manage their finances conveniently from their smartphones. With this app, customers can check their account balances, view transaction history, and transfer funds between accounts. It also provides features for paying bills and depositing checks using the camera on the device. Additionally, the app offers security features such as biometric login options and alerts for suspicious activity. Users can also access their credit card information, rewards, and offers directly through the app. Overall, the Citibank Mobile App aims to enhance the banking experience with ease and accessibility.