A subdomain is a website address, that's under a main, or a root domain. One example 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 website and records i.e. apart from using the domain name as part of the whole web address, a subdomain can be entirely independent and also hosted by a separate company. Employing a subdomain can be extremely handy if you'd like to have different web sites which are connected in some way. As an example, you may have an online store under the main domain and a forum under a subdomain in order to offer means for your customers to ask questions or share views concerning your products. The benefit of employing a subdomain as opposed to 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.