What does the following manifest mean?

Question

Android

intent-filter>
     action android:name="android.intent.action.MAIN" /> 
     category android:name="android.intent.category.LAUNCHER" />
/intent-filter

what does android mean. android point, is this a class?
intent.category.launcher, because category.launcher is a constant and is written as category_launcher ,
why is everything written with a dot in the intent class?
Well, what exactly do these lines mean, thanks

Answer 1

wanted to know what the following manifest means

Answer 2

that this is one of the inputs to the application, that's what it means.