ViewModel in android.

ViewModel is part of the android architecture component. Android architecture components are the components that are used to build robust, clean, and scalable apps. Android architecture components hold some classes to manage UI components and Data persistence. The ViewModel class is designed to store and manage UI-related data in a lifecycle-conscious way. ViewModel classes are used to store the data even the configuration changes like rotating screen. ViewModel is one of the most critical class of the Android Jetpack Architecture Component that support data for UI components. Its purpose is to hold and manage the UI-related data. Moreover, its main function is to maintain the integrity and allows data to service during configuration changes like screen rotations. Any kind of configuration change in Android devices tends to recreate the whole activity of the application. It means the data will be lost if it has been not saved and restored properly from the activity which was destroyed. To avoid these issues, it is recommended to store all UI data in the ViewModel instead of an activity. 



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