ActiveX is a proprietary type of script (like JavaScript) developed by Microsoft that is used on Windows based machines. It adds even more dynamic and interesting content to a Web page like advanced video control or even 3D graphics.

 

As with JavaScript, be cautious when Internet Explorer detects a possible bad ActiveX control or does not recognize the type of ActiveX control. It could be a virus or spyware program in disguise. Internet Explorer will always alert you when it finds a possible security threat, so when in doubt, don't visit that particular Web site unless you are sure that the content contained in the Web site is safe.