it's a lightweight embeddable scripting language. Really easy to learn and can do some decent heavy lifting. It's used a lot in game dev and in rapid prototyping. WOW and Roblox leverage it for skinning, and lots of mobile games too. all table based, to keep the codebase light and easy to use.Don't judge me, I've never heard of Lua.
For example, these declarations are functions used further down in the code to define syscalls and render a visual result.
For this bar graph