An access log is a thorough list of all the files that were accessed by the guests of a certain Internet site. Every single file that was requested for whatever reason shall be listed, so if you have one page with 3 embedded images, one video and one embedded text file, as an illustration, the access log will contain a total of 6 entries - one for any of the 6 files which were accessed when the site visitor opened the webpage. A log usually shows the file name and path, the date, as well as the visitor’s Operating System, browser and IP address. In some cases you could also find the referrer sites that sent the visitors to your site. The data which an access log file contains is in human-readable plain text format. It can be processed by special software on a desktop machine and used to prepare reports on the overall performance of a site, in addition to the web statistics your server may have generated.