How to pass a value from JS to PHP without reloading the page?

Question

PHP

There is a page. It is necessary that when clicking on a certain element, a variable with the value n is passed to php. Next, the PHP script is executed and again, without reloading the page, a block is loaded into html, the id of which corresponds to the value of the passed variable. Need logic or implementation example. I'm not familiar with AJAX and JSON, but if you point me in the right direction, I think I'll figure it out. Thanks to all.

Answer 1

Running here :)

Answer 2

$.ajax({
  type: 'POST',
  url: 'response.php?action=sample2',
  data: 'name=Andrew&nickname=Aramis',
  success: function(data){
    $('.results').html(data);
  }
});

An example of how to implement. The PHP script will receive POST data (name and nickname). Further processing and return of result. Right?