hey @RT3 As we know that outsytem is a low code platform and have various widget and features. here reactive and mobile app are similar feature and development environment except Mobile app have some additional features like local database/offline database ,sync of data between device and server, plugins to communicate with device like camera, contacts, push notification etc and than creating packages the .apk or .ipa installation file ( as told by @Devendra Singh Baghel ) for better understanding please refer the guided path .
thank you