Among these settings, we can mention whether the application designed on the operating system is installed or not. For example, using user interfaces, users can easily use them to be informed whether the application is installed on the system or not. In this part of the tutorial, we want to tell users about whether or not the application is installed on the system. Also, if the application is not installed on the system, go to the application's virtual stores at high speed to purchase and install the requested version of the application. In this case, it will first check whether the application has been installed on the system or not, and if the application is not installed, refer to virtual stores such as Google Play or stores to purchase and install.

Here are some things you will learn in this part of the tutorial:

- When and in what cases do we need to know if an application is installed on the system?- Create a project to ensure and check whether the application is installed on the system- How to direct and transfer users to the page and window of virtual stores to purchase and install applications- When and in what cases do we need to know if an application is installed on the system?In this part of the tutorial we will give you examples so that you can know the reasons why we need to know if the application is installed on our system or not. For example, consider the situation that the existence and installation of an application depends on other applications, and in order for other applications to function properly, this application must be installed on the system. That's why we have to program in a way that I can go through to make sure they are installed or not. If the desired application, on which the performance of other applications also depends, is not installed on the system, a page and a window should be opened to take the user to the download and installation page of the desired application.In other cases, consider applications for online taxis, of which there are two versions of the application. One version is for passengers and the other version is for online taxi drivers. If one of the versions of these applications is not installed on the Android system of the driver or passenger, to continue and complete the process, it is necessary to ensure that both versions of the application are installed on the systems, because the performance of this type of applications depends on each other. Must have both types of installation installed. After the installation process of installing both versions of the application, if the installation of each of these versions is not installed, the relevant window and page will open so that users can download the application. 

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