An access log includes a record of all of the files that have been requested by the visitors while exploring your site. The list is thorough, so in case you have a web page with two embedded images, for instance, all of the three files will be in the log, not only the page. An access log usually contains the date, the OS, the browser and the IP address for every file in human-readable form, so you can get a more complete picture about the hottest files on your website. The log, that is also frequently named "raw data", is an addition to the web stats which you commonly get with a hosting account, not a replacement. An illustration why you might need this sort of a log is if you wish to use some software on your computer system to prepare a report about the website’s functionality, but you do not want to use the standard graphs and tables which come with the server-generated website statistics.