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

wxdqz

New Member
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?
 
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