www is an old protocol from back when everything was under a separate server. www (www.example.com) was the web server, mail (mail.example.com) was the mail server, ftp (ftp.example.com) was the FTP server, print (print.example.com) was the print server, etc.
These days, everything is run under the web server, making www. redundant and a waste of four characters.
Thank you for your rapid answer. The reason that I wanted to prefix my URL with “www” is that I find that when I type my URL in an email or document, a hyperlink will only be attached if I prefix it with “www”. Otherwise, I have to manually insert the hyperlink, a minor pain.
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