An error log is a list of the error messages and warnings that appeared for one reason or another while your visitors were browsing your site. This sort of a log contains raw information on the way the hosting server has addressed requests in various situations. An error message might appear if, for example, a link leads to a page or a file that is not on the web server, if the code on a particular page cannot be processed, if someone is trying to access the Internet site or its back office via an IP address that's blocked by an .htaccess rule and so forth. The data in the error log offers the IP of the website visitor, what error message appeared and the root cause for the web server to show it, the full path to the file which caused the error and the specific time of the event. Having this data will permit you to figure out if any part of your Internet site has a problem, which you may then take care of. For that reason, your website visitors will have a better experience and you will optimize the site for maximum performance.