In agreement with bm. The domain (eg google.com) handles many services and the www kind of says which service it is using (www, mail, smpt, pop, ftp...). Of course, as www traffic is probably the most common kind, servers will most likely know what is expected, and act accordingly. Many servers are configured to redirect traffic from (eg) google.com to www.google.com. One reason for this is ...
Hostname is an attribute of a system stored locally on that system. "Computer name" is what Windows uses to refer to the hostname. A subdomain is a DNS concept. In DNS, domain names (domains for short) can be authoritative or non-authoritative - if they are non-authoritative, that means another server "handles" that domain. So in a domain such as www.mysite.invalid - one thing that could ...
In MTG, you want to get as much value as possible out of each and every card. That often means finding ways to get multiple uses out of abilities, and one of the best ways to do so has become the name of an entire archetype: blink.
Enter the keyword Flash - here comes a card ability that has unlimited potential to mess with the MTG stack and the overall state of play. Spells that couldn't be used to counterattack suddenly can be, and those pesky creatures are popping up everywhere.
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Edit: to answer your original question, yes, any member of www-data can now read and execute /var/www (because the last bit of your permissions is 5 = read + exec). But because you haven't used the -R switch, that applies only to /var/www, and not to the files and sub-directories it contains. Now, whether they can write is another matter, and depends on the group of /var/www, which you haven't ...