An access log is a comprehensive list of all the files which were accessed by the guests of a given site. Any file that was requested in some way shall be listed, so if you have one webpage with 3 embedded pics, one video and one embedded text file, for example, the access log shall contain a total of six entries - one for each of the 6 files that were accessed when the site visitor opened the page. A log normally contains the file name and path, the date, in addition to the visitor’s OS, web browser and IP address. Sometimes you may also find the referrer websites that sent the visitors to your website. The data that an access log file features is in human-readable plain text format. It can also be processed by special software on a laptop or computer and used to prepare reports on the overall performance of an Internet site, aside from the web statistics your server may have generated.