what is lua mostly used for code example

Example 1: What is lua used for

Lua is a powerful and fast programming language that is easy to 
learn and use and to embed into your application. 

Lua is designed to be a lightweight embeddable scripting language.
It is used for all sorts of applications, 
from games to web applications and image processing.

-- 

Used commonly in Roblox, Garry's Mod and Multi Theft Auto

Example 2: what is a value lua

--[[ Eight types of values: nil, boolean, number string, userdata, function, 
thread, and table
nil == nothing
boolean == true or false
number == 5
string == 'fun' 'dog'
userdata ==