Scripting language modules embed a programming language like Lua, JavaScript, Perl, C#, and so on, into FreeSWITCH, and transfer functionality between the core and the language's runtime. This allows things like IVR applications to be written in that scripting language, with a simple interface back to FreeSWITCH for all the heavy lifting. Language modules usually register into the core with the application interface and the FSAPI interface and are executed from the Dialplan. Language modules offer lots of opportunities and are very powerful. Using language modules, you can build powerful real-time communication applications in a standard programming language you already know, using its libraries for data manipulations and legacy interfacing.