What is the difference between define and require in RequireJS?

Question

What is the difference between define and require, and when should I use each of them? I have read different answers on Stack Overflow, but I still haven't been able to understand.

For example, if this was on main.js (config file require points to), what is the difference?

define(["jquery"], function($) {
 do something with $            
});

require(["jquery"], function($) {
 do something with $            
});

Is $/jQ guaranteed to be loaded and ready in both?

Answer 1

They do the same thing internally. But...... you should define your entry point of your app using require and define the rest of the modules using define. I find that this keeps it clear what role the current module you're looking at is actually playing in terms of your whole app.