As a webmaster your sole purpose is to have your business made visible to a lot of Internet users from all over the world and one way to do this is to use more than one domain name. This can be done by subscribing to multiple domain hosting. Apart from this you are offered with another alternative for increasing the visibility of your business through the variant known as sub-domain.
There are many companies making use of sub-domains in order to display their business through as many means as possible. Search engines will also be able to identify the sub-domain, so this is moreover a reason to use this route for your website’s increased visibility. It is called a sub-domain because it comes as a secondary stage of a primary domain name. For instance if you own a domain called http://www.some-url.com then a sub-domain you could create could be something like: support.some-url.com
Another use for a sub-domain name is either utilize it as the primary website extension or as a completely new website. You can submit sub-domain’s to Yahoo, Bing or Google the same way you would submit a standard domain to them. This sub-domain can be used in displaying a pay per click (PPC) campaign along with other similar purposes. Sub-domains can be a powerful tool for advertising campaigns.
Out of all the other usages, the best one that defines it as very relevant is to have the sub-domain related to the primary business. For instance, it makes no sense to create a sub-domain that sells weight loss products when your primary domain name describes a business dealing with IT products. Therefore its role as an advertising tool becomes essential and more at your convenience.
Most web hosting packages that you will come across offer the possibility of creating as many sub-domains off your primary domain as you want for free. While you can get as many as you feel like, you should be aware they will take a lot of your time to build/develop each of them. Therefore reach for creating a sub-domain out of your original domain name only if you plan to make proper use of it.