jQuery/Javascript the comparison operators "===" and "=="
<p>in dreamweaver cc 2015, when i am using the comparison operators in jquery/javascript programming like:</p>

<pre><code> if(x == "")
</code></pre>

<p>DW shows an error that Expected <strong>===</strong> and instead saw <strong>==</strong>. My question is that what is the difference between === and == ?. 
As i know in other languages like C# etc the === operator means that the comparison will check the Data Type of the value as well as the value. In javascript or jquery is there any problem if i use the == instead of === ? or still the result will be the same in jquery / javascript?</p>