Analytics is the method of analyzing your web traffic – how many unique hits, how many return visitors, which page they came to your web on, what page referred them, what hours of day is your website busiest, what files are people downloading most, what pages are most popular, etc.
Google and Bing make it easy, but only if you can insert certain tags in certain parts of your pages, which at the time are not available for editing.
It would be great to be able to FTP an XML site map too!