Definition of ActiveX:
ActiveX is used to create pieces of pre-coded software called ActiveX controls (similar to plug-ins or add-ins on other browsers). If, for example, you are trying to access a webpage that has plays Flash files, you can download a Flash ActiveX control in order to play the files directly in your browser without opening a new application. Basically, the controls extend a browser's functionality, allowing it to perform tasks it would otherwise not be capable of doing natively. It's particularly useful for playing videos and other multimedia content, skipping the step of opening a seprate media player.
Microsoft Corporations component software that duplicates some capabilities of Java. Based on object linking and embedding (OLE) technology, it allows inclusion of executable code in a document or webpage. In a networked environment (such as the Internet), it permits software components written in different programming languages to interact with one another via messaging aided by the Windows operating system. ActiveX controls are known to be inherently insecure through which unauthorized access to a computer may be obtained. See also Javabeans.
Meaning of ActiveX & ActiveX Definition