An access log contains a record of all files which have been requested by the visitors while browsing your Internet site. The list is detailed, so if you have a page with 2 embedded images, for instance, all of the three files shall be in the log, not only the page. An access log normally includes the date, the Operating System, the Internet browser and the IP address for each and every file in human-readable form, so you can get a good idea about the most popular files on your Internet site. The log, that's also typically named "raw data", is an addition to the web data you normally get with a hosting account, not a substitute. A good example why you may need this sort of a log is if you would like to use some software on your computer to prepare a report about the website’s performance, but you do not want to use the conventional graphs and tables which come with the server-generated web statistics.