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IONIC - Era of Hybrid Mobile Application

Ionic is a framework on top of Cordova which is a framework for building "hybrid apps". Please consider that Ionic is not the only framework using Cordova and Cordova is not the only framework for hybrid apps.
In general, using the hybrid app approach allows you to write apps as they were webpages (HTML, CSS and Javascript), which are then "run" inside a webview of a native app (basically an instance of the system's browser). 
What Cordova does, is extending the standard Javascript API with new APIs (packaged as "plugins") that give access to the operating system's features that are not usually available to the browser (like sensors, contact list, cameras etc.). 
Given that most mobile operating systems have decent browsers which are, roughly, all compatible with standards, and given that plugins are written (or should be) for all mobile operating systems, hybrid apps can be developed once for all mobile OS.
For Android, Ionic supports Android 4.1 and up. For iOS, Ionic supports iOS 7 and up. Ionic 2 supports the Universal Windows Platform for building Windows 10 apps. Ionic Framework, powered by Angular.js, supports BlackBerry 10 apps.

Advantages
1.      It is cross platform and lets you write the same app once for multiple platforms. 
2.      It will even change the look a bit to match the native standards for each platform it supports.
3.      Code once, run on all mobile devices.
4.      One code base.
5.      Good availability of "plugins"
6.      Graphically very nice (if you like the iOS style).
7.      Design, Ionic takes care of design and follows platform guidelines, meaning that apps have different look & feel depending on the platform they are running.

Disadvantage
1.      Less performance as it's not completely native, not that much of an issue unless making games or high load apps, the ones that uses a lot of resources.
2.      Android is VERY fragmented, and there are very old versions out there people still use (although there is a workaround called crosswalk).
3.       Don't even dare using it for heavily graphical stuff like 3D or videogames.
4.      You don't have plugins for everything, and if you need something specific, you'll need to program it for all the target OSes.
i.e. PayPal plugin only available for IOS and Android.











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