Sub-domains are used to divide websites into different sections and is a name (often 'descriptive') placed before the main domain and which replaces the www. prefix when viewing/entering the URL.
Sub-domains can help in organising large web sites into manageable sections, and also help with search engine listings / placement.
e.g...
example.anthonykeenan.com (http://example.anthonykeenan.com)
support.anthonykeenan.com
hosting.anthonykeenan.com
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