a web address goes <servername>.<domainname>.<extension>
if you just do [google.com](https://google.com) then the dns for [google.com](https://google.com) needs to redirect it go a server or else it goes nowhere. by default it goes to the www server. back when the internet was new, it was just convention to do it “properly” by putting [www](http://www). nowadays, if you just type [domainname.com](https://domainname.com) it by default goes to www (but not always), depends how the dns is setup for it.
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