What is the difference between pages that use www and those that don't? On iGuRu.gr you will not see the prefix www on address Website URL? Why; What is better for SEO? Should you change your page URL?
Below we will see all the answers for the above questions in detail.
Before we start: for an average user and a small business owner, there is absolutely no difference in the addresses between www and non-www. The difference is purely technical and basically does not matter.
Yes there is a technical difference between the two that we will cover later in the article, but for most people it shouldn't matter so much as there are no SEO benefits of choosing one address or the other. Even Google says it all depends on your preference.
What is important and should be mentioned is that the URL you chose at the start of your page should not be changed. In other words, DO NOT change your site's URL to add or remove its prefix World Wide Web.
You can tell Google about your personal preference from your Google Webmaster Tools account. 
With a click on the sprocket, you can tell Google what is the preferred URL. 
If you have not added your site to Google Webmaster Tools, you must do so by following the instructions in the following link:
https://www.google.com/webmasters/tools/home?hl=el
At iGuRu.gr we do not use www from personal preference. Usually we do not use www because we do not really need it. Below we mention the technical difference between WWW use and non-use
When you add www. in front of a page, it acts as a host name computer το οποίο μπορεί να προσφέρει περισσότερη ευελιξία στα DNS, τη δυνατότητα περιορισμού των cookies στη χρήση πολλαπλών subdomains And much more. The domains that do not use the prefix are also referred to as naked domains and do not have these technical advantages.
For more technical details, you can to read here.
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