Whether you call them web metrics, web analytics, or web statistics, it is all the same thing: the behavior of visitors on your site. Being able to measure this behavior is the biggest advantage of web sites over traditional mediums.
The difficulty with web metrics is that most people don't really know what to look for. A term like 'hits' is frequently used to indicate a lot of traffic to a web site, but really hits may not be where it's at. 'Page', 'file', and 'hits' are antiquated terms that should boil down to one thing, visitors.