Arma 3 is a very modular and editable sandbox enviornment for military simulation. Scripting is the use of built in commands and functions in the game to have a desired effect in the sandbox. It is essentially programming additions or modifications to the current game enviornment.

Arma 3 GUI Tutorial/ Simple Vehicle Selector

Forum post (Contains other good links to check out)

A simple tutorial for how to create a custom user interface in game
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