There are many different places you can sell your app. If it’s an Android app, the most basic place to list it is on Google Play. If you have developed it using a cross-platform tool, then your app can have a version for iOS, Android, bada, or other platforms, and therefore you can list your app at the markets available for each of those platforms.
However, when you release an app to the world you are trusting that your app will work correctly for every person who may download it. If there is a bug that you’ve overlooked, or if your app has a problem running on certain devices that you have not tested you app on, you could face negative customer feedback.
Another strategy is to release your app to a more limited market at first, collect feedback, and improve your app before doing a “worldwide release” across many markets.
Because Samsung reviews and certifies every app before posting it to Samsung Apps, this process helps you catch any bugs or other issues you may have overlooked, and it also tests your app on a broad range of Samsung devices. Once your app is certified, it is then available to customers using Samsung devices. This gives you an opportunity to collect feedback and make fixes or improvements to your app based on that feedback, so that when you are ready to release your app to other markets, you can have a much higher level of confidence, and you are more likely to have positive feedback from Samsung customers in order to promote your app on other markets.