What is a sub-domain? This is a domain with a unique indentifier that proceeds your domain name. Example: Your domain name is www.marysmith.com - a sub-domain could be shop.marysmith.com. You may have several reasons to set up sub-domains; one popular reason is for site theming, which Google likes to see.
You can set up as many sub-domains as you see fit and you are only limited by your available resources, such as server space and the like.
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