Adobe has announced it will stop distributing and updating Flash Player at the end of 2020 and is encouraging web developers to migrate any existing Flash content to open standards. Apple is working with Adobe, industry partners, and developers to complete this transition.
Apple users have been experiencing the web without Flash for some time. iPhone, iPad, and iPod touch never supported Flash. For the Mac, the transition from Flash began in 2010 when Flash was no longer pre-installed. Today, if users install Flash, it remains off by default. Safari requires explicit approval on each website before running the Flash plugin.
Read more at Webkit.org