This goes for devices within the same "family" as well; the app will adjust itself to display as perfectly on a Galaxy Note as it does on a Galaxy S6, or remodel itself from an iPhone version to an iPad one.
This is not a native app, but the web version of your app. It’s a URL that can be accessed on any browser, including desktop, tablets (even ones we don’t support, such as Android), and in any smartphone (again, ones we don’t support such as Windows Phones or BlackBerry).
A software that adds a specific feature to the app. For example, the GoodBarber WordPress plugin allows you to directly connect your WordPress site and have it appear natively in the app. GoodBarber also has a “Plugin” section in which you can create your own, custom plugin if you want to create something we don't offer.
Also commonly called a Business App. If you would like to create an app, but have it available for download only to specific users, you must purchase an Apple Enterprise account ($299/year) to be able to distribute the iOS version out of the App Store. For the Android version, you can just distribute the app whichever way you want, you don’t need any specific account or authorization.
Your app won’t be available to the general public in the stores, just the individuals you indicate.