Why l am getting advertisements while operating mobile

[gangubai]

Why I'm getting advertisements in between 

[RαʝҽʂԋKυɱαɾ21]

WHICH TYPE OF ADS ?
COMMENT SCREENSHOT OF THAT

[Sidhabhi]

Turn off customization services,also check recently installed 3rd party apps

[sanjú]

The galaxy store were the one who was giving ads but samsung has stopped it.
If you are still getting it clear data of galaxy store and open, but this time don't allow the promotion(something like that)option.