Plug-ins are small software helpers that allow you to watch videos on the Internet or play games. But be careful: hackers use security holes again and again to cause damage. Without the plug-in, the Internet, as we know it today, would not work. An example: If you want to watch a video on a video platform or in the online offer of a TV station, click on the video field and off you go. It's that easy for the user. In the background but runs a small software helper and that is the plug-in. Plug-in means "connect" or more cumbersome: "extension module". The plug-in ensures that the video can be viewed on the website. Actually website and video have different formats. So that one format can now be displayed or played in the other, this extension is needed. For video platforms, for example, this is often the Adobe Flash or Quick time player. The plug-in is an elegant solution to integrate sophisticated applications, such as a video player, smart into a we