Let's say you have a website www.example.com and because of the great content you have put up there, people are starting to link to it.
That's fantastic I hear you say, or is it?
Because people are sloppy, so the link to example.com as well as www.example.com, so when search engines come by they will find example.com and www.example.com
But now you have another even bigger problem, because these search engines will think www.example.com and example.com are two different sites with the same content, and then you will have to wait and see which they will serve to your potential clients. Or worse, you get banned.
