jquery $.post function's result data

Question

When I make an ajax call (see code below), what is \"data\". How do I set and get data

//  $.post()  
 $(\"#post\").click(function(){  
     $(\"#result\").h         


        

Answer 1

$.post('fileName.php',{

data: $('#id').val(),
},
function(response)
{
  alert(response);
}
}