[crankylinuxuser]

Thats the difference between a domain name and a fully qualified domain name.

If you've ever administered BIND, you'll note that you need to add a ending . to A records. Thats the FQDN.

Now, our browsers link cookies to domain. And interestingly enough (example.com)!=(example.com.)

That's why sites like nytimes.com. gets around the paywall, because you don't have a cookie history with that site.