13 November 2015 Last updated at 00:05 GMT
Released in 1996, the browser plug-in enabled animations, interactivity and streaming video on what was a largely static web.
But the software has been plagued by security problems, and has been criticised for affecting computer performance and battery life.
Now many experts say the media plug-in's days are numbered. Watch the video to find out more.
A few years ago, it was difficult to browse the web without coming across a site using Flash.