Definitions for "Sub Domains"
Second-level domains can be divided into further domain levels. These subdomains sometimes represent different computer servers within different departments.The Third-level domain name includes the Second-level domain name. For example, in:, "sales" is a third-level domain. "" is a second-level domain name (and includes the top-level domain name of ".com").
A sub domain is a sub-division of a larger domain. For example, "" is a sub domain of ""
Are prefixes to your domain name. (i.e They are useful for replacing really long web addresses (i.e. and for hiding locations (i.e. goes to