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Any app that accepts input from users should ensure that the input is valid.Without validation, a user can supply data that causes the app to fail.Architectural guidance for developing adaptable, maintainable, and testable Xamarin.Forms enterprise applications This e Book provides guidance on how to implement the Model-View-View Model (MVVM) pattern, dependency injection, navigation, validation, and configuration management, while maintaining loose coupling.If those dependencies have not yet been created, the container creates and resolves their dependencies first. Forms class implements the publish-subscribe pattern, allowing message-based communication between components that are inconvenient to link by object and type references.This mechanism allows publishers and subscribers to communicate without having a reference to each other, helping to reduce dependencies between components, while also allowing components to be independently developed and tested. Forms includes support for page navigation, which typically results from the user's interaction with the UI, or from the app itself, as a result of internal logic-driven state changes.Developers of enterprise apps face several challenges that can alter the architecture of the app during development.Therefore, it's important to build an app so that it can be modified or extended over time.

App settings are data that an app creates and manages, and user settings are the customizable settings of an app that affect the behavior of the app and don't require frequent re-adjustment.

We will not get into more detailed explanation about the database but just a breif for undertsanding.

Database is a collection of data stored in a computer disc space or server space.

Dependency injection containers reduce the coupling between objects by providing a facility to instantiate class instances and manage their lifetime based on the configuration of the container.

During the objects creation, the container injects any dependencies that the object requires into it.

In simple words it is a space where your data is been stored.