Basic lua: Introduction
From The Official Visionaire Studio: Adventure Game Engine Wiki
What is Lua Script
Lua Script is a lightweight cross-platform scripting language that was originally created as an extension of sorts, to further extend upon already existing programming languages, but over time, it has grown in popularity due to how easy it is to learn, & the amount of time saved in creating simple functions & tables etc.
Lua script is now the primary or secondary language of a lot of game engines, besides being used in various applications & web design.
What is the meaning of LUA
Actually it's not LUA at all. Lua is not an abbreviation or acronym of any kind, it is actually the Portuguese word for moon.