The difference between local and regular?

local variables are in a scope, when they're put at the top of a script they can be used for everything in the script because everything is in their scope. However, if you put a local variable inside of a function, you can only use it inside of that function, if you don't make it local, it can be accessed outside of the function, because it's global. You can also set a variable later by making it local.

local var
var = "hello"

function pr()
	local var = "Hello"
end

print(var) ->nil

function pr()
	var = "Hello"
end

print(var) ->Hello