An access log is a detailed list of all the files which were accessed by the visitors of a given website. Every single file which was requested for whatever reason shall be listed, so if you have a single webpage with 3 embedded pictures, one video and one embedded text file, for example, the access log will contain a total of 6 entries - one for each of the 6 files which were accessed when the visitor opened the page. A log usually shows the file name and path, the date, plus the visitor’s Operating System, worldwide web browser and IP address. Occasionally you could also find the referrer sites that sent the visitors to your site. The data that an access log file features is in human-readable plain text format. It can be processed by special software on a personal computer and used to write reports on the overall performance of a website, independent of the web statistics which your server may have produced.