How do i add a script and what is a script

will someone tell me what a script is and how to add one? thanks

WoW  

Scripts are used to change aspect of your game, all your game is programmed in ruby language, so with access to the scripts database, u can edit all u want to change in your game, menu, battle all!
u can add any scripts in scripts database (F10 if i'm not wrong lol), u put or u edit them depend what u need to do.
(so sorry for my bad english)