What we are going to build in this article? DAO: DAO is a Data Access Object which is used for mapping SQL queries to functions.The room uses DAO to issue queries to the SQLite database. It simplifies the database work and serves as an access point to the underlying SQLite database. Room Database: Room Database is an improvised version of SQLite Database.Entity: Entity is an annotated class that is used to describe a database table when we are working with Room.Repository: Repository is a class that is mainly used to manage multiple sources of data.The ViewModel instances survive Activity/Fragment recreation. The UI no longer needs to worry about the origin of the data. ViewModel: View Modal acts as a communication center between repository and UI.Live Data automatically manages all of this since it is aware of the relevant lifecycle status changes while observing. It holds as well as caches the latest version of the data and notifies our observer whenever the data is being updated or changed. LiveData: Live Data is a data holder class that can be observed.The components which we will be using inside the application are listed below with a detailed explanation : Image Slider in Android using ViewPager.Firebase Authentication with Phone Number OTP in Android.How to Retrieve Data from the Firebase Realtime Database in Android?.How to Post Data to API using Retrofit in Android?.Implicit and Explicit Intents in Android with Examples.How to View and Locate SQLite Database in Android Studio?.

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