An access log is a text file which contains a full list of all the files accessed by your site visitors. All the files that were requested in one way or another shall be included, so when you have a PHP script app and a website visitor opens only the home page, for instance, you might find numerous files inside the log. This is because there are things on the home page which are embedded - parts of other webpages, images, and so on. All of these files will be listed in the access log, so you can get a complete picture of the way your website functions. The data is in plain text format, so the logs are occasionally referred to as "raw data" as well. An access log shows the name of each and every requested file, the path to it, the date it was accessed, plus the user’s IP address, web browser and OS. More information, such as the referrer website, is typically provided as well. A log file could be processed by various desktop apps for statistical purposes as an addition to the web statistics generated by your website hosting server.