An error log is a listing of the error messages and warnings that showed up for one reason or another while your visitors were browsing your Internet site. This kind of a log contains raw info on the way the web server has dealt with requests in various situations. An error message may appear if, for instance, a link leads to a website or a file that isn't on the server, if the code on a specific page can't be processed, if someone is trying to access the site or its back office using an IP address that is blocked by an .htaccess rule etc. The information within the error log features the IP address of the visitor, what error message appeared and the basis for the hosting server to show it, the full path to the file which caused the error and the exact time of the event. Having this info will allow you to determine if any part of your site has an issue, which you may then clear up. Consequently, your website visitors will have a better experience and you will supercharge the site for optimum performance.