An access log is a text file which contains a full report on all of the files accessed by your site visitors. All the files which were requested in one way or another shall be included, so when you have a PHP script application and a site visitor opens just the home page, for example, you might find plenty of files inside the log. The reason is that there are resources on the home page which are embedded - parts of other pages, images, and so on. All these files will be listed inside the access log, so you're able to get a complete picture of the way your Internet site works. The data is in plain text format, so the logs are frequently referred to as "raw data" as well. An access log shows the name of every requested file, the path to it, the date it was accessed, as well as the user’s IP address, browser and OS. More information, like the referrer site, is sometimes provided too. A log file can be processed by various desktop apps for statistical purposes as an addition to the web statistics supplied by your website hosting server.