Reference: 'Main domain' and search-engine friendly domain redirect
|The 'primary' or 'main' domain name is one of your site's domain names. Your main domain is used in the Google Search Results, provided the 'Automatically Generate Sitemap for Website' check box is ticked for your site (see Automated submission of Google Site Map for more information).
To identify your site’s main domain name, please go to Swifty platform Dashboard > Settings > Manage Website Domains.
Swifty Registered indicates whether a domain name is registered by Swifty or not.
Secure Domain indicates which domain name is used for the secure connection (see Checkout via secure connection for more details about secure connection)
To change your site’s main domain name and/or enable a search-engine friendly domain redirect, go to Edit Domain Settings.Once the 'Enable search-engine friendly domain redirect' check box is ticked and the site has been published, the main domain's URL will be http://www.maindomain.com
(http://www.maindomain.co.uk in this example) and all other domain names associated with your site (incl. the main domain without 'www') will automatically redirect to the main domain name.
If the 'Enable search-engine friendly domain redirect' check box is unticked, no redirects will be applied and the main domain's URL will be http://maindomain.com ( http://mydomain.co.uk in this example), i.e. without 'www'.
Search engines consider http://domain.com and http://www.domain.com to be different websites. As a result, if a website has been linked to from other websites using a mix of the two URLs you are effectively splitting the potential benefit of valuable link popularity. Using the 'Enable search-engine friendly domain redirect' facility, you can effectively consolidate all of your link popularity to a single URL. This consolidation will serve to increase website’s chances of obtaining and maintaining top rankings.