An error log is a list of the error messages and warnings which showed up for one reason or another while your visitors were browsing your site. This kind of a log contains raw information about the way the server has addressed requests in different situations. An error message may appear if, for example, a link leads to a site or a file that isn't 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 via an IP address that is blocked by an .htaccess rule and many others. The information inside the error log includes the IP of the visitor, what error message appeared and the root cause for the web server to show it, the entire path to the file that caused the error and the specific time of the event. Having this information will permit you to figure out if any part of your Internet site has an issue, that you can then resolve. For that reason, your website visitors will have a better experience and you'll optimize the Internet site for optimum performance.