Browser developers have made it increasingly difficult to enable Flash and now that the end of 2020 is near, have begun to eliminate it completely. Furthermore, if you have Flash installed, you may have already noticed messages telling you to uninstall it.
Since the end of life announcement in 2017, software developers have been moving away from Flash to other platforms. You may have heard of HTML5 which is one of the more standard choices.
In general, you can safely uninstall Flash, unless you are running an old application or accessing an old website which has not been updated to use something besides Flash. If you are, you best start looking around for a replacement, because one way or another, Flash will either disappear from your system or stop working.