A subdomain is a website url, which is under a main, or a root domain name. An example is something.domain.com, where domain.com is the main domain address, while "something" is the subdomain below it. Each and every subdomain can have its own site and records i.e. aside from using the domain name as a part of the whole web address, a subdomain can be completely independent and also hosted by a separate provider. Employing a subdomain can be very handy if you'd like to have different websites which are associated in some way. As an example, you can have an on-line store under the main domain along with a forum under a subdomain in order to supply means for your customers to ask questions and share views regarding your products. The advantage of employing a subdomain rather than a subfolder is that the websites are going to be separated, so you're able to update one of them or perform maintenance not affecting the other.