title: Info about Action MAIN and Category Launcher in Android Manifest
body: <p>In the Android manifest file, what do you mean by the category Launcher and action MAIN
        <b><br>category android:name="android.intent.category.LAUNCHER"
        <br>action android:name="android.intent.action.MAIN"</b>
  <br> Is it possible to make one activity the laucher and another one the main action?</p>