In this final module, you will implement notifications to improve user engagement and inform users about essential reminders they might have set up in the app. By reading through optional labs, you will then learn how to publish your application on different marketplaces, such as the App Store and Google Play. Finally, you will explore app marketing strategies to promote your app to potential users. You will be required to implement a notifications lab. The publishing and marketing labs are optional but highly recommended. You will submit your work for review at the end of this module.