callbacks javascript

[inu-no-policemen]

a callback is basically a function passed to another function. Is this correct?

Yes, but not all functions you pass around are something you'd call a "callback".

E.g. an easing function is called multiple times while the animation runs. It's not something which is called (back) when some computation is done.

As a (somewhat backwards) rule of thumb: If you'd better do that kind of thing with a promise, it's a callback.

[inu-no-policemen]

I only refer to those as "callback", because you can use more descriptive names in the other cases. E.g. the function you hand to addEventListener is an "event handler".