An access log includes a record of all of the files that have been requested by the visitors while surfing around your site. The list is detailed, so in case you have a web page with two embedded images, for example, all of the three files shall be in the log, not just the page. An access log normally features the date, the OS, the browser and the IP address for every single file in human-readable form, so you can get a more complete picture about the most popular files on your Internet site. The log, that's also often referred to as "raw data", is an addition to the web stats you usually get with a hosting account, not a substitute. An illustration why you may need this sort of a log is if you want to use some software on your PC to prepare a report about the website’s performance, but you do not want to use the regular graphs and tables that come with the server-generated web statistics.