Why does it sometimes have www and other times it doesn't?

There are some sites where I don't need the www, and others times I do need it. Is there a reason for this? A different type of server?

And if I am promoting my website, should I promote it with the www or not?

Does this effect the number of hits that are recorded on my page depending on whether people type in www?

 

www is a subdomain of your domain, it's been branded into pretty much every consumers mind though now, so make sure you at least are using both (forward one ontop of the other)

 

Use one of the two, and redirect the other to the one that you use.

 

This happens beacause of 'A' entry

You need canonical enteries pointing to same IP

only then both will work

Regards

Alex

 

Thanks. But where and how do I forward www.mydomain.x to mydomain.x?

Sorry I've never done this before

 

probably easiest if you asked your webhosting company to set this up

 

Find out which one Google has indexed, redirect the other to that one, then you can promote it anyway you like (but I'd still have links go to the one Google has indexed).

 

do webhosting companies do this for me?

 

Do what for you?

 

Forward the www to the one without the www. What do I ask them exactly?

 

Nope, you can do it yourself.
http://www.webweaver.nu/html-tips/web-redirection.shtml
http://www.webconfs.com/how-to-redirect-a-webpage.php