What is the difference between "Built-in iRidium drivers" and "JS Modules"?

Built-in (native) drivers are included in the standard iRidium base. Such drivers are quickly set up in GUI Editor. They are standardized and are provided with detailed instructions and examples.

Script drivers are always created on the base of the native AV & Custom Systems driver with the help of iRidium scripts (the programming language based on Java Script). They are used for controlling any systems which are not included int he standard iRidium base.

Usually the script drivers are distributed with the visualization project (for example, XBMC, Sonos, iTunes, ... ).