Just to expand/clarify Jeri, the stuff usualy gets put in a server log. Here is a line from one of mine, a visit from google in this case.

66.249.66.38 - - [27/Oct/2006:02:53:53 +0100] "GET /abctest/gettxt.php?songid=452 HTTP/1.1" 200 2026 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

A program like awstats makes use of the logs to produce its reports.