Today I went to a site that displays information on domains. I wanted to look at how we are doing so I entered Morovia in the search box. Quickly surprisingly I received a message

Morovia is an Invalid Extension.

difficult to understand uuuh? Obviously you have to put your full domain name - in this case, Otherwise it thinks morovia is the top domain name. But even so, why it is called “extension”? File names have extensions; while domain names have suffixes.