Difference b/w having www and not having it in the URL
i'm often left wondering what's the significance of having "www" and not having it in the URL. i was further surprised to encounter certain URLs which had www2/3/...

i thought we have only one world-wide-web. and is the 'www' part just a symbolic inclusion, and something like www.abc.com and abc.com are one and the same thing?
Difference b/w having www and not having it in the URL
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i'm often left wondering what's the significance of having "www" and not having it in the URL. i was further surprised to encounter certain URLs which had www2/3/...

i thought we have only one world-wide-web. and is the 'www' part just a symbolic inclusion, and something like www.abc.com and abc.com are one and the same thing?