A subdomain is a web address, that's under a main, or a root domain name. One example is something.domain.com, in which domain.com is the main domain name, while "something" is the subdomain below it. Every single subdomain can have its own website and records i.e. aside from employing the domain name as a part of the whole web address, a subdomain can be entirely independent and also hosted by a different service provider. Using a subdomain can be extremely handy if you want to have different web sites which are associated in some way. For example, you may have an on-line store under the main domain as well as a forum under a subdomain so as to supply means for your customers to ask questions and / or share experiences about your products. The best thing about employing a subdomain instead of a subfolder is that the sites are going to be separated, so you are able to update one of them or perform maintenance without affecting the other.