Many people including webhost do not realize the importance of the .htaccess file in relation to search engine optimization. You may not be aware of this but SEs (especially Google) will treat domain.com and www.domain.com as different pages.
This is referred to as a canonicalization issue which
can be taken care of using mod_rewrite in the .htaccess file.
Unfortunately a lot of host do not allow a webmaster to use a .htaccess file. Fortunately JagPc as a top web host does.
No site should be accessed by domain.com and www.domain.com. You should decide which you want and redirect one to the other with a 301 redirect.
Of course a redirect means you need to be able to use a .htaccess file.
I’ll have more to say about this later. This is somewhat o a test post.
Believe me the canonicalization issue is real. It can affect you with the SEs.