What is jquary no conflict?

Many JavaScript libraries use $ as a function or variable name, just as jQuery does. In jQuery's case, $ is just an alias for jQuery, so all functionality is available without using $. If you need to use another JavaScript library alongside jQuery, return control of $ back to the other library with a call to $.noConflict(). Old references of $ are saved during jQuery initialization; noConflict() simply restores them.

If for some reason two versions of jQuery are loaded (which is not recommended), calling $.noConflict( true ) from the second version will return the globally scoped jQuery variables to those of the first version.

<script src="other_lib.js">script>
<script src="jquery.js">script>
<script>
$.noConflict();
// Code that uses other library's $ can follow here.
script>