A subdomain is a website address, that is under a main, or a root domain. An illustration is something.domain.com, where domain.com is the main domain name, while "something" is the subdomain below it. Each and every subdomain can have its own site and records i.e. aside from employing the domain name as part of the whole web address, a subdomain can be entirely independent and even hosted by a separate service provider. Using a subdomain can be quite practical if you want to have different websites which are related in some way. For example, you could have a web-based store under the main domain as well as a forum under a subdomain in order to supply means for your clients to ask questions and share thoughts concerning your products. The benefit of employing a subdomain rather than a subfolder is that the sites will be separated, so you are able to update one of them or perform maintenance without affecting the other.