When the time of optimize your website comes, some people like the www suffix in front of the domain name, while others decide to get rid of it completely.

Here are some reasons why you should use the WWW before the domain name:

• People that don’t use Internet on a daily basis relate “www” and “.com” with Internet surfing.
• It balances out the domain name, when using 3 elements: www.artegami.com
• When you introduce the domain name in the URL  bar in the navigation bar and press CTRL+Enter, automatically you’ll be able to see www and .com. If your website is configured without the ”www” on the front, it will take 3 additional seconds before you can access the site.

Reasons for not using WWW:

• it’s redundant when using the http:// protocol
• Your web site has a sub-domain
• because you just don’t like the WWW

Source: Webmaster Source