The Flash Player (also known as Shockwave) has been around since the mid-1990s and was used to create enriched website experiences through the use of animation and enhanced web-enabled forms. Over the years Flash lost its popularity particularly with the release of HTML 5 animation. Adobe has since declared that the support for Adobe Flash Player will end on December 31, 2020 and recommends using the HTML 5 standard instead of Flash.
Microsoft plans to remove Flash from the Windows operating system in a January 2021 Windows Update. In the meantime, if you are presented with the following pop-up window to uninstall Flash, you can uninstall Flash from your computer in advance of Microsoft's January 2021 Windows Update.
There is no need to install an alternate software program. HTML 5 support is built into all of today's current Internet "web browsers" such as Microsoft Edge, Google Chrome and Mozilla Firefox. If you are using an older Internet browser you may have to update to a current version.
FOR MORE INFORMATION
If you are interested to learn more about the history of the Adobe Flash Player, visit the Wikipedia page.
Check out this article describing why the industry has moved from Flash to HTML 5.