In a bid to give more control on what users see on Twitter, It has introduced quality filter and Notification settings.
— Twitter Support (@Support) August 18, 2016
Notification settings will give users ability to limit notifications from everyone to the ones only they follow on mobile and desktop. Users can access these settings directly from notifications tab.
Twitter has also introduced Quality Filters in the new update. This will restrict Automated, Duplicate tweets to give users better experience.