newbie approach: what is a javascript callback function?

Question

Is just a function that executes after one other function that calls it, finishes?

Please I know (almost) nothing about programming, and I find it quite hard to find

Answer 1

A callback function is a function that is automatically called when another process ends. They are very usefull in asyncronous process, like get a page.

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EDIT

Example: You want to get make a ajax call (get a page for example). And you want to run some function when donwload finishes.

With jquery, you can use this:

$.get('PageIWant.html', myCallBack);

function myCallBack (data){
  alert('I have got the page!');
}