Do you like or dislike incomming notifications on your cellphone? How about filtering it by keywords and receiving only the notifications of your interest?
They called you on social media, messages, emails, etc. By the words you have chosen, the APP will notify you.
It blocks all notifications and only permit just what you chosen or it permit all notifications and blocks only what you chosen.
Get more time and spend less time looking at notifications that you don't care about.