Question

In jQuery some time ‘$’ making trouble, what is the basic reason ? Answer in detail.

Thanks in Advance

jQuery(function () {
        $("#tabs").tabs();
    });

jQuery(function () {
        jQuery("#tabs").tabs();
    });

Answer 1

its because other library also use $ so there will be conflict use jQuery.noConflict()

jQuery.noConflict();
(function($) { 
  $(function() {
    // more code using $ as alias to jQuery
  });
})(jQuery);

or like

<script type="text/javascript" src="other_lib.js"></script>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
  $.noConflict();
  jQuery(document).ready(function($) {
    // Code that uses jQuery's $ can follow here.
  });
  // Code that uses other library's $ can follow here.
</script>