An access log is a text file that contains an extensive list of all of the files accessed by your website visitors. All of the files which were requested in one way or another shall be included, so when you have a PHP script application and a website visitor opens only the home page, for instance, you might find plenty of files in the log. The reason is that there are things on the home page which are embedded - parts of other pages, pics, and so on. All of these files will be listed inside the access log, so you can get a detailed picture of the way your Internet site performs. The info is in plain text format, so the logs are sometimes referred to as "raw data" as well. An access log provides the name of each and every requested file, the path to it, the date it was accessed, along with the user’s IP address, browser and Operating System. More info, such as the referrer website, is usually supplied too. A log file may be processed by various desktop programs for statistical purposes as an addition to the web stats supplied by your server.