How to use require?

I seen moderation services use the code require to not view their code how would I do that? Ex:

require(12345)

require is what you use to access what a ModuleScript returns. Module/require usage:

--A module script in the workspace

module = {}

function module.add5(number)
	return number + 5
end

function module.print2(text)
	print(text)
end

return module --Return the table of functions

And then

--A regular old script

stuff = require(workspace.ModuleScript)

twelve = stuff.add5(7)
print(twelve)

stuff.print2("sup")

You can then upload that ModuleScript to Roblox, and then use that module's asset ID rather than the ModuleScript's location in your game to use the module.