An access log is a comprehensive list of all the files that were accessed by the visitors of a given website. Every file that was requested for some reason shall be listed, so if you have a single webpage with three embedded pictures, one video and one embedded text file, for example, the access log will contain a total of six entries - one for every of the six files which were accessed when the visitor opened the webpage. A log normally provides the file name and path, the date, along with the visitor’s Operating System, worldwide web browser and IP address. Oftentimes you may also find the referrer websites that sent the visitors to your Internet site. The data which an access log file features is in human-readable plain text format. It could be processed by special software on a desktop machine and used to write reports on the efficiency of a website, independent of the web stats your hosting server may have created.