If you’re new to online marketing you might be wondering why you see some websites with www in front of the URL in the browser and some without the www. Furthermore, you could be asking whether that www is necessary. Really, it’s not.
As far as SEO is concerned, you don’t get any additional search engine benefits either way. And as for branding, there’s nothing to add to the benefits on that end either. The only issue you’ll run into regarding the www in your domain name is with duplicate content. If you fail to point your DNS to the one you are not using then you could have duplicate content issues with the search engines. While there is no penalty for that per se, you could see some drop in rankings or a de-listing altogether of one of those – and it could be the one that you want to use.
To prevent those kind of issues, one of the first things you want to do when you buy your new domain name is point the DNS to one or the other. In other words, you want people who type in www to landing the site without the www, or vice-versa. To make that happen, you need to make sure your web host redirects all traffic from the one you aren’t using to the one that you are. Your host can help you get that done if you need it.