Starting June 30, 2016, Google will no longer accept advertisements that use Flash. What this means: Better security for you and your organization. You needn’t buy anything or change anything. It will all happen automatically.
Flash is a tool used on web-sites to, among other things, play videos.
When people visit websites, they can be vulnerable to what is referred to as a drive by download. Just by visiting a site, even a legitimate site, their computer may be exposed to an attack.
That attack can happen via a Flash video within an advertisement that was surreptitiously posted by an attacker.
It is always a good idea to use “click to play” functionality that prevents Flash content from running automatically.
Now, when Google stops accepting advertisements with Flash content, that will significantly diminish the Flash vector of attack.