<div>
They CAN be different if the web administrator wishes it. &nbsp;<br />
They are technically different DNS A records but in most cases they point to the same place.<br />
Not all websites work without the www though because someone forgot or chose not to put the A record on the main address.
</div>


They CAN be different if the web administrator wishes it.  
They are technically different DNS A records but in most cases they point to the same place.
Not all websites work without the www though because someone forgot or chose not to put the A record on the main address.

<div>
Does this mean the user did not type the www to get to roofgenius.com ?
</div>


Does this mean the user did not type the www to get to roofgenius.com ?

<div>
<div class="content wysiwyg-content">
I have had an Adsense account for about 10 yrs.<br />
They show earnings for<br />
<a href="http://www.roofgenius.com" rel="ugc">www.roofgenius.com</a><br />
and <br />
roofgenius.com<br />
whats the difference ?
</div>
</div>


I have had an Adsense account for about 10 yrs.
They show earnings for
www.roofgenius.com
and 
roofgenius.com
whats the difference ?

verification, been curious a long time

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.