Considering example of an iOS device, devices powered by iOS operating system are programmed or comes embedded with applications designed by and for Apple products only. You cannot find Safari browser on the Android Play store. It is just what makes iOS a complete stand out operating system for the users. Though, Android doesn't restrict it's application to not be downloaded and used on an iOS devices.
No matter if it is an mobile application development or a complete software development for a PC, each of them has a specific process of steps to be followed, since you cannot directly jump to program the functionality of an application rather initially you will plan your steps and design. You can learn more about mobile development life cycle on the Web.
I find that the harder I work, the more luck I seem to have.
Like web application development, mobile application development has its roots in more traditional software development. One critical difference, however, is that mobile apps are often written specifically to take advantage of the unique features of a particular mobile device. For example, a gaming app might be written to take advantage of the iPhone's accelerometer or a mobile health app might be written to take advantage of a smartwatch's temperature sensor.
Today, the two most prominent mobile platforms are iOS from Apple and Android from Google. Phones and tablets from Apple come preloaded with essential applications, including a full web browser and the Apple App Store. Android devices also come preloaded with similar apps and you can install more using the Google Play Store.
so the today era mobile application more usable than web application
For example: social media mobile apps, lifestyle mobile apps, games/entertainment mobile apps etc.