Definitions for "Sub-Domain"
These created under domain names. Many free webhosts you to use a sub-domain to host a website. Example you could create a sub-domain called "mine" on the domain and it would become
A web page address within a primary domain that points to a sub-directory within the primary domain. For example, is a domain. is a sub-domain, or subdirectory within the domain. The reason you can get to without typing (you can type simply is the “www” is the default sub-domain of the primary domain of Table One or more rows of cells on a page used to organize the layout of a page or arrange data systematically.
a child of a parent domain
Keywords:  cyber, i've, directory, main, instead
a lower level directory in your main directory - except it goes at the FRONT of your web site name instead of after the
a section of your main web site, set up and recognized as it's own cyber real estate
a section of your site dedicated to something you create but instead of residing within your normal directory, it resides within it's own directory,like I've illustrated below
Keywords:  hostname, zone, own, file
a hostname which has its own zone file