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8                            App Development
















                         Your Aim


                         to learn about:
                                 What is an App?                            The Android and iOS
                                  Categories of Mobile Apps                   Varieties of  Apps
                                   Downloading and Installing an App           Developing an App



                     WHAT IS AN APP?

                 An app is a software program primarily developed for hand-held smart devices such as mobile and

                 tablet. It helps them perform their personal and professional tasks more effectively. The app is a
                 modern term derived from the word application. Generally, the word app is used to refer to the
                 applications on smart devices such as mobiles and tablets. Thousands of apps are available for
                 smart devices. Most of the apps are freely downloadable. However, some of the apps need to be
                 purchased from the app store.
                 The three most popular app stores are  Google's Play Store,

                 Apple's App Store, and Microsoft Store. However, the Microsoft
                 Store  is not in use for mobile devices. But you can download the
                 apps for your computer from the Microsoft Store.
                 The three main types of applications are as follows:

                    Desktop Applications: The application that is mainly developed for a computer or laptop is
                   called a desktop application. This type of application depends on the hardware and operating
                   system on which it runs. It is usually developed for a particular operating system. Some of the
                   examples of desktop applications are Paint, Notepad, and Word.

                    Mobile Applications: The software program that is developed for hand-held devices such
                   as smartphones and tablets is called a Mobile application (also known as a mobile app).
                   These apps are installed and run on the device itself. Some of the examples of mobile apps
                   are Snapchat, WhatsApp, and Facebook Messenger.

                    Web Applications: The  application  program  that  is stored  on  a  remote  server  and
                   accessed over the Internet through a Web browser interface is called a Web application.





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