An access log features a record of all files that have been requested by the visitors while browsing your website. The list is detailed, so in case you have a webpage with 2 embedded images, for example, all of the three files shall be in the log, not only the page. An access log usually includes the date, the OS, the Internet browser and the IP address for each file in human-readable form, so you can get a more complete picture about the most popular files on your site. The log, which is also typically called "raw data", is an addition to the web data which you normally get with a hosting account, not a substitute. An example why you might need such a log is if you intend to use some software on your PC to prepare a report about the website’s functionality, but you do not want to use the regular graphs and tables that come with the server-generated web statistics.