Adobe Flash is the audio/video technology behind many web sites such as YouTube, and it is important to keep your Flash current. The reason for this is that Flash is increasingly a target of computer security exploits, and theoretically the latest version will have the best security. So how do you find out the Flash version installed on your computer to see if it is the current version? Its easy. Adobe has a test page to give you that information here:
Version test for Adobe Flash Player