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jQuery Core in jQuery

jQuery Core

jQuery accepts a string enclosed with double quote (“”) that can contain a CSS selector which is used to match a set of elements on the web page. 

jQuery code can start with either “jQuery” word or a “$” (dollar symbol). Take a look at below code snippet 

<script language="javascript" type="text/javascript"> 
 $(function () { 
 jQuery("#div1").css("border", "2px solid red"); 
 });
 </script>

OR 

<script language="javascript" type="text/javascript"> 
$(function () { 
 $("#div1").css("border", "2px solid green"); 
 });
 </script>

Both above code snippets are functionally same and do the same thing. So you can either user jQuery or $ when you are writing jQuery code.