An error log is a listing of the error messages and warnings which appeared for one reason or another while your visitors were surfing around your website. Such a log includes raw information on the way the web server has handled requests a number of situations. An error message may appear if, for example, a link leads to a webpage or a file that is not on the hosting server, if the code on a certain page can't be processed, if somebody is trying to access the Internet site or its back office using an IP address that is blocked by an .htaccess rule and so forth. The info in the error log includes the IP of the visitor, what error message appeared and the reason for the server to show it, the entire path to the file that generated the error and the precise time of the event. Having this information will help you figure out if any part of your site has a problem, that you can then take care of. Therefore, your visitors will have a better experience and you'll boost the website for optimum performance.