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I'll assume you know what the Domain Naming System (DNS) is though not necessarily how it works, not that you actually need to. Suffice to say it is the Internet quivalent of a telephone directory, where you can lookup a name and it will tell you the number to dial. In DNS parlance this is an 'A' record
Now, keeping that analogy, several people (a family) may reside at that property or in the case of a company, departments, so our system needs to be able to differentiate between those people or departments. In the case of a telephone call you would ask for the person, with HTTP requests you don't ask instead a name is prepended to the location such as ftp, mail, booking or www.
The reason for the hostname and the 'www' being one and the same is purely historical and simply comes from Tim Berners-Lee naming his invention being called the World Wide Web.
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A foolish consistency is the hobgoblin of little minds
Thought for today:- Is SEO the only industry where all the cowboys are Indians?
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