Plug-in
Plug-in (connect) may refer to hardware and software. In the case of software, it designates a program that is linked into another software product, whereby but in contrast to the add-on, it represents independent software. The plug-in is always compatible with the existing software. Through plug-ins it is possible certain View and process file formats. Plugins are often provided by third party manufacturers such as Real Player, Macromedia Flash etc. developed.